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w in (-oo:+oo)
3*w-3 = 7*w+1 // - 7*w+1
3*w-(7*w)-3-1 = 0
3*w-7*w-3-1 = 0
-4*w-4 = 0 // + 4
-4*w = 4 // : -4
w = 4/(-4)
w = -1
w = -1
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