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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-9-1 = 0
-1/4*x-9-1 = 0
-1/4*x-10 = 0
-1/4*x-10 = 0
-1/4*x-10 = 0 // + 10
-1/4*x = 10 // : -1/4
x = 10/(-1/4)
x = -40
x = -40
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