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w in (-oo:+oo)
(7*w+7)/3 = (9*w-4)/4+4 // - (9*w-4)/4+4
(7*w+7)/3-((9*w-4)/4)-4 = 0
(7*w+7)/3+(-1*(9*w-4))/4-4 = 0
(4*(7*w+7))/(3*4)+(-1*3*(9*w-4))/(3*4)+(-4*3*4)/(3*4) = 0
4*(7*w+7)-1*3*(9*w-4)-4*3*4 = 0
w-48+40 = 0
w-8 = 0
(w-8)/(3*4) = 0
(w-8)/(3*4) = 0 // * 3*4
w-8 = 0
w-8 = 0 // + 8
w = 8
w = 8
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