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w in (-oo:+oo)
(3*w+7)/2 = (4*w+7)/6+4 // - (4*w+7)/6+4
(3*w+7)/2-((4*w+7)/6)-4 = 0
(3*w+7)/2+(-1*(4*w+7))/6-4 = 0
(6*(3*w+7))/(2*6)+(-1*2*(4*w+7))/(2*6)+(-4*2*6)/(2*6) = 0
6*(3*w+7)-1*2*(4*w+7)-4*2*6 = 0
10*w-48+28 = 0
10*w-20 = 0
(10*w-20)/(2*6) = 0
(10*w-20)/(2*6) = 0 // * 2*6
10*w-20 = 0
10*w-20 = 0 // + 20
10*w = 20 // : 10
w = 20/10
w = 2
w = 2
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