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w in (-oo:+oo)
7*w+4 = 2*w-46 // - 2*w-46
7*w-(2*w)+4+46 = 0
7*w-2*w+4+46 = 0
5*w+50 = 0 // - 50
5*w = -50 // : 5
w = -50/5
w = -10
w = -10
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