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w in (-oo:+oo)
w-(4*w)+6 = 3 // - 3
w-(4*w)-3+6 = 0
w-4*w-3+6 = 0
3-3*w = 0 // - 3
-3*w = -3 // : -3
w = -3/(-3)
w = 1
w = 1
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