-21=-7/5x

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Solution for -21=-7/5x equation: 


x in (-oo:+oo)

-21 = (-7/5)*x // - (-7/5)*x

-((-7/5)*x)-21 = 0

(7/5)*x-21 = 0

7/5*x-21 = 0 // + 21

7/5*x = 21 // : 7/5

x = 21/7/5

x = 15

x = 15

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