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w in (-oo:+oo)
8-3*w = 4*w-62 // - 4*w-62
8-3*w-(4*w)+62 = 0
8-3*w-4*w+62 = 0
70-7*w = 0 // - 70
-7*w = -70 // : -7
w = -70/(-7)
w = 10
w = 10
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