+0  
 
0
390
2
avatar

$${{\mathtt{7}}}^{{\mathtt{x}}}{\mathtt{\,\small\textbf+\,}}{{\mathtt{7}}}^{\left({\mathtt{x}}{\mathtt{\,-\,}}{\mathtt{2}}\right)}{\mathtt{\,\small\textbf+\,}}{\mathtt{7}}{\mathtt{\,\times\,}}\left({\mathtt{x}}{\mathtt{\,\small\textbf+\,}}{\mathtt{1}}\right) = {\mathtt{7}}{\mathtt{\,\times\,}}{\mathtt{393}}$$

 Aug 18, 2015

Best Answer 

 #1
avatar+17747 
+5

If the original problem were entered slightly incorrectly:

  7x + 7(x - 2) + 7(x + 1)  =  7·393

7x + 7· 7-2 + 7x · 71  =  7·393

(1 + 7-2 + 7) · 7x  =  7·393

(1 + 1/49 + 7) · 7x  =  7·393

(393/49) · 7x  =  7·393

 7x  = (7·393)·(49/393)

 7x  = 7·49 = 73

x = 3

 Aug 18, 2015
 #1
avatar+17747 
+5
Best Answer

If the original problem were entered slightly incorrectly:

  7x + 7(x - 2) + 7(x + 1)  =  7·393

7x + 7· 7-2 + 7x · 71  =  7·393

(1 + 7-2 + 7) · 7x  =  7·393

(1 + 1/49 + 7) · 7x  =  7·393

(393/49) · 7x  =  7·393

 7x  = (7·393)·(49/393)

 7x  = 7·49 = 73

x = 3

geno3141 Aug 18, 2015
 #2
avatar
0

$${{\mathtt{7}}}^{{\mathtt{x}}}{\mathtt{\,\small\textbf+\,}}{{\mathtt{7}}}^{\left({\mathtt{x}}{\mathtt{\,-\,}}{\mathtt{2}}\right)}{\mathtt{\,\small\textbf+\,}}{\mathtt{7}}{\mathtt{\,\times\,}}\left({\mathtt{x}}{\mathtt{\,\small\textbf+\,}}{\mathtt{1}}\right) = {\mathtt{7}}{\mathtt{\,\times\,}}{\mathtt{393}} \Rightarrow {\mathtt{x}} = {\mathtt{\,-\,}}{\frac{\left({\mathtt{50}}{\mathtt{\,\times\,}}{{\mathtt{7}}}^{\left({\mathtt{x}}{\mathtt{\,-\,}}{\mathtt{2}}\right)}{\mathtt{\,-\,}}{\mathtt{2\,744}}\right)}{{\mathtt{7}}}}$$

Easy one and difficulty:normal 

 Aug 19, 2015

4 Online Users

avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.