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x in (-oo:+oo)
(1/4)*(x-8)+(1/2)*(x+2) = x+15 // - x+15
(1/4)*(x-8)+(1/2)*(x+2)-x-15 = 0
1/4*(x-8)+1/2*(x+2)-x-15 = 0
1/4*(x-8)+1/2*(x+2)-x-15 = 0
3/4*x-x-15-1 = 0
-1/4*x-15-1 = 0
-1/4*x-16 = 0
-1/4*x-16 = 0
-1/4*x-16 = 0 // + 16
-1/4*x = 16 // : -1/4
x = 16/(-1/4)
x = -64
x = -64
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