-21=-3/7x

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Solution for -21=-3/7x equation: 


x in (-oo:+oo)

-21 = (-3/7)*x // - (-3/7)*x

-((-3/7)*x)-21 = 0

(3/7)*x-21 = 0

3/7*x-21 = 0 // + 21

3/7*x = 21 // : 3/7

x = 21/3/7

x = 49

x = 49

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