-9=-3/7x

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Solution for -9=-3/7x equation: 


x in (-oo:+oo)

-9 = (-3/7)*x // - (-3/7)*x

-((-3/7)*x)-9 = 0

(3/7)*x-9 = 0

3/7*x-9 = 0 // + 9

3/7*x = 9 // : 3/7

x = 9/3/7

x = 21

x = 21

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