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