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w in (-oo:+oo)
7-3*w = 2*w-8 // - 2*w-8
7-3*w-(2*w)+8 = 0
7-3*w-2*w+8 = 0
15-5*w = 0 // - 15
-5*w = -15 // : -5
w = -15/(-5)
w = 3
w = 3
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