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w in (-oo:+oo)
3*w+8 = -5*w-40 // + -5*w-40
3*w-(-5*w)+8+40 = 0
3*w+5*w+8+40 = 0
8*w+48 = 0 // - 48
8*w = -48 // : 8
w = -48/8
w = -6
w = -6
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