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x in (-oo:+oo)
(x+1)/2+6 = (x+7)/8 // - (x+7)/8
(x+1)/2-((x+7)/8)+6 = 0
(x+1)/2+(-1*(x+7))/8+6 = 0
(8*(x+1))/(2*8)+(-1*2*(x+7))/(2*8)+(2*6*8)/(2*8) = 0
8*(x+1)-1*2*(x+7)+2*6*8 = 0
6*x-6+96 = 0
6*x+90 = 0
(6*x+90)/(2*8) = 0
(6*x+90)/(2*8) = 0 // * 2*8
6*x+90 = 0
6*x+90 = 0 // - 90
6*x = -90 // : 6
x = -90/6
x = -15
x = -15
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