15=-5/7u

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Solution for 15=-5/7u equation: 


u in (-oo:+oo)

15 = (-5/7)*u // - (-5/7)*u

15-((-5/7)*u) = 0

(5/7)*u+15 = 0

5/7*u+15 = 0 // - 15

5/7*u = -15 // : 5/7

u = -15/5/7

u = -21

u = -21

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