21=7/4w

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Solution for 21=7/4w equation: 


w in (-oo:+oo)

21 = (7/4)*w // - (7/4)*w

21-((7/4)*w) = 0

(-7/4)*w+21 = 0

21-7/4*w = 0 // - 21

-7/4*w = -21 // : -7/4

w = -21/(-7/4)

w = 12

w = 12

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