21=7/3w

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Solution for 21=7/3w equation: 


w in (-oo:+oo)

21 = (7/3)*w // - (7/3)*w

21-((7/3)*w) = 0

(-7/3)*w+21 = 0

21-7/3*w = 0 // - 21

-7/3*w = -21 // : -7/3

w = -21/(-7/3)

w = 9

w = 9

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