-15=-5/7u

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Solution for -15=-5/7u equation: 


u in (-oo:+oo)

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

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