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w in (-oo:+oo)
3*w-10 = -6*w-100 // + -6*w-100
3*w-(-6*w)-10+100 = 0
3*w+6*w-10+100 = 0
9*w+90 = 0 // - 90
9*w = -90 // : 9
w = -90/9
w = -10
w = -10
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