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#1**+1 **

a) 7/10[d +5/6] = 7, multiply both sides by 10 / 7

[d + 5/6] = 10

[6d + 5] / 6 = 10 cross multiply

6d + 5 = 60 subtract 5 from both sides

6d =55 divide both sides by 6

**d = 55 / 6**

b)

5c/4 - 2c/3 =7/10 Put the LHS over the CD=12

[15c - 8c] /12 = 7/10

7c / 12 = 7/10 cross multiply

7c = 84/10 divide both sides by 7

c =84 / 10 x 1/7

c = 84 / 70 divide both sides by 14

**c = 6/5**

Guest May 11, 2018

edited by
Guest
May 11, 2018