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w in (-oo:+oo)
7*w+7 = 4*w-8 // - 4*w-8
7*w-(4*w)+7+8 = 0
7*w-4*w+7+8 = 0
3*w+15 = 0 // - 15
3*w = -15 // : 3
w = -15/3
w = -5
w = -5
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