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w in (-oo:+oo)
3-(7*w) = -4*w-27 // + -4*w-27
3-(7*w)-(-4*w)+27 = 0
4*w-7*w+3+27 = 0
30-3*w = 0 // - 30
-3*w = -30 // : -3
w = -30/(-3)
w = 10
w = 10
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