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w in (-oo:+oo)
(3/4)*w-((1/2)*w)-4+12 = 0
(3/4)*w+(-1/2)*w-4+12 = 0
1/4*w+8 = 0 // - 8
1/4*w = -8 // : 1/4
w = -8/1/4
w = -32
w = -32
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