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w in (-oo:+oo)
5*w-(2*w)+7 = 43 // - 43
5*w-(2*w)-43+7 = 0
5*w-2*w-43+7 = 0
3*w-36 = 0 // + 36
3*w = 36 // : 3
w = 36/3
w = 12
w = 12
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