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w in (-oo:+oo)
(3/4)*w+8 = (1/3)*w-7 // - (1/3)*w-7
(3/4)*w-((1/3)*w)+7+8 = 0
(3/4)*w+(-1/3)*w+7+8 = 0
5/12*w+15 = 0 // - 15
5/12*w = -15 // : 5/12
w = -15/5/12
w = -36
w = -36
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