-9=-3/7w

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


w in (-oo:+oo)

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

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

(3/7)*w-9 = 0

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

3/7*w = 9 // : 3/7

w = 9/3/7

w = 21

w = 21

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