21=-7/8w

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Solution for 21=-7/8w equation: 


w in (-oo:+oo)

21 = (-7/8)*w // - (-7/8)*w

21-((-7/8)*w) = 0

(7/8)*w+21 = 0

7/8*w+21 = 0 // - 21

7/8*w = -21 // : 7/8

w = -21/7/8

w = -24

w = -24

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