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x in (-oo:+oo)
(1/4)*(x-8)+(1/2)*(x+2) = x-9 // - x-9
(1/4)*(x-8)+(1/2)*(x+2)-x+9 = 0
1/4*(x-8)+1/2*(x+2)-x+9 = 0
1/4*(x-8)+1/2*(x+2)-x+9 = 0
3/4*x-x-1+9 = 0
9-1/4*x-1 = 0
8-1/4*x = 0
8-1/4*x = 0
8-1/4*x = 0 // - 8
-1/4*x = -8 // : -1/4
x = -8/(-1/4)
x = 32
x = 32
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