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w in (-oo:+oo)
(5*w+9)/2 = (3*w+7)/8+10 // - (3*w+7)/8+10
(5*w+9)/2-((3*w+7)/8)-10 = 0
(5*w+9)/2+(-1*(3*w+7))/8-10 = 0
(8*(5*w+9))/(2*8)+(-1*2*(3*w+7))/(2*8)+(-10*2*8)/(2*8) = 0
8*(5*w+9)-1*2*(3*w+7)-10*2*8 = 0
34*w-160+58 = 0
34*w-102 = 0
(34*w-102)/(2*8) = 0
(34*w-102)/(2*8) = 0 // * 2*8
34*w-102 = 0
34*w-102 = 0 // + 102
34*w = 102 // : 34
w = 102/34
w = 3
w = 3
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