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w in (-oo:+oo)
4*(3*w+4) = 4 // - 4
4*(3*w+4)-4 = 0
4*(3*w+4)-4 = 0
12*w+12 = 0
12*w+12 = 0
12*w+12 = 0 // - 12
12*w = -12 // : 12
w = -12/12
w = -1
w = -1
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