15=5/7w

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Solution for 15=5/7w equation: 


w in (-oo:+oo)

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

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

(-5/7)*w+15 = 0

15-5/7*w = 0 // - 15

-5/7*w = -15 // : -5/7

w = -15/(-5/7)

w = 21

w = 21

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