-w/5=-21

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Solution for -w/5=-21 equation: 


w in (-oo:+oo)

-w/5 = -21 // + 21

21-w/5 = 0

21-1/5*w = 0 // - 21

-1/5*w = -21 // : -1/5

w = -21/(-1/5)

w = 105

w = 105

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