21=7/5w

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Solution for 21=7/5w equation: 


w in (-oo:+oo)

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

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

(-7/5)*w+21 = 0

21-7/5*w = 0 // - 21

-7/5*w = -21 // : -7/5

w = -21/(-7/5)

w = 15

w = 15

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