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w in (-oo:+oo)
5*w+2 = 6*w+7 // - 6*w+7
5*w-(6*w)-7+2 = 0
5*w-6*w-7+2 = 0
-w-5 = 0 // + 5
-w = 5 // * -1
w = -5
w = -5
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