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w in (-oo:+oo)
(3/4)*w-((1/2)*w)-4 = 0
(3/4)*w+(-1/2)*w-4 = 0
1/4*w-4 = 0 // + 4
1/4*w = 4 // : 1/4
w = 4/1/4
w = 16
w = 16
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