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

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

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

w = -21/7/3

w = -9

w = -9

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