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w in (-oo:+oo)
4*w-(5*w)+10 = 18 // - 18
4*w-(5*w)-18+10 = 0
4*w-5*w-18+10 = 0
-w-8 = 0 // + 8
-w = 8 // * -1
w = -8
w = -8
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