#1**0 **

8n-(2n-3)=12

8n -2n + 3 = 12

6n + 3 = 12 subtract 3 from both sides

6n = 12 - 3

6n = 9 divide both sides by 6

n = 9/6

**n= 1 1/2**

.5d-3d+5=0

-2.5d + 5 = 0 subtract 5 from both sides

-2.5d = -5 divide both sides by -2.5

d = -5/-2.5

**d = 2**

-(w+5)=-14

-w - 5 = -14 add 5 to both sides

-w = -14 + 5

-w = -9 multiply both sides by -1

**w = 9**

2/3+n+6=3/4 subtract 6 2/3 from both sides

n = 3/4 - 6 2/3

n =3/4 - 20/3 GCD of 3 and 4 is 12

n =9/12 - 80/12

n = -71/12

**n = - 5 11/12**

a/20+4/15=9/15

Solve for a:

a/20 + 4/15 = 3/5

Put each term in a/20 + 4/15 over the common denominator 60: a/20 + 4/15 = (3 a)/60 + 16/60:

(3 a)/60 + 16/60 = 3/5

(3 a)/60 + 16/60 = (3 a + 16)/60:

(3 a + 16)/60 = 3/5

Multiply both sides of (3 a + 16)/60 = 3/5 by 60:

(60 (3 a + 16))/60 = (60×3)/5

(60×3)/5 = (60×3)/5:

(60 (3 a + 16))/60 = (60×3)/5

(60 (3 a + 16))/60 = 60/60×(3 a + 16) = 3 a + 16:

3 a + 16 = (60×3)/5

3 a + 16 = 12×3

12×3 = 36:

3 a + 16 = 36

Subtract 16 from both sides:

3 a + (16 - 16) = 36 - 16

16 - 16 = 0:

3 a = 36 - 16

36 - 16 = 20:

3 a = 20

Divide both sides of 3 a = 20 by 3:

(3 a)/3 = 20/3

3/3 = 1:

**a = 20/3**

Guest Oct 6, 2017