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x in (-oo:+oo)
(-4/1)*(x-8)+(2/1)*(x+2) = x+3 // - x+3
(-4/1)*(x-8)+(2/1)*(x+2)-x-3 = 0
2*(x+2)-4*(x-8)-x-3 = 0
2*(x+2)-4*(x-8)-x-3 = 0
36-2*x-x-3 = 0
36-3*x-3 = 0
33-3*x = 0
33-3*x = 0
33-3*x = 0 // - 33
-3*x = -33 // : -3
x = -33/(-3)
x = 11
x = 11
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