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x in (-oo:+oo)
(2/3)*(x-3) = (1/2)*(2*x+4) // - (1/2)*(2*x+4)
(2/3)*(x-3)-((1/2)*(2*x+4)) = 0
(2/3)*(x-3)+(-1/2)*(2*x+4) = 0
2/3*(x-3)-1/2*(2*x+4) = 0
2/3*(x-3)-1/2*(2*x+4) = 0
-1/3*x-4 = 0
-1/3*x-4 = 0
-1/3*x-4 = 0 // + 4
-1/3*x = 4 // : -1/3
x = 4/(-1/3)
x = -12
x = -12
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