-15=-5/7x

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


x in (-oo:+oo)

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

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

(5/7)*x-15 = 0

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

5/7*x = 15 // : 5/7

x = 15/5/7

x = 21

x = 21

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