12=w/3-9

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Solution for 12=w/3-9 equation: 


w in (-oo:+oo)

12 = w/3-9 // - w/3-9

9-(w/3)+12 = 0

21-1/3*w = 0 // - 21

-1/3*w = -21 // : -1/3

w = -21/(-1/3)

w = 63

w = 63

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