A/7+1/4=5/6 solve for a

A/7+1/4=5/6

a/7=4a/28

1/4=7/28

4a/28+7/28 = (4a+7) / 28

(4a+7) / 28=5/6

multiply both sides by 28

4a+7=70/3=23 1/3

subtract 7 from both sdies

4a=16 and 1/3

divde both sides by 4

a=4 1/12

12a / 84 + 21 / 84 = 70 / 84;

(12 a + 21) / 84 = 70 / 84;

12a + 21 = 70;

12a = 49;

a = 49 / 12;