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w in (-oo:+oo)
3*w+1 = 5*w-3 // - 5*w-3
3*w-(5*w)+1+3 = 0
3*w-5*w+1+3 = 0
4-2*w = 0 // - 4
-2*w = -4 // : -2
w = -4/(-2)
w = 2
w = 2
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