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w in (-oo:+oo)
5*w-(4*w)+7/10 = -83/10 // + -83/10
5*w-(4*w)+7/10-(-83/10) = 0
5*w-4*w+7/10+83/10 = 0
w+9 = 0 // - 9
w = -9
w = -9
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