5-a/8=4/7 solve for a show your work

Subtract 5 from both sides

a/-8 = 4/7 - 5

simplify 4/7 - 5 to 31/-7

a/-8 = 31/-7

multiply both sides by 8

-a = 31/-7 x 8

simplify 31/7 x 8 to 248/7

-a = 248/7

multiply both sides by - 1.

The answer is a = 248/7

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