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x in (-oo:+oo)
(1/2)*(4*x-12) = 4*x // - 4*x
(1/2)*(4*x-12)-(4*x) = 0
(1/2)*(4*x-12)-4*x = 0
1/2*(4*x-12)-4*x = 0
1/2*(4*x-12)-4*x = 0
-2*x-6 = 0
-2*x-6 = 0
-2*x-6 = 0 // + 6
-2*x = 6 // : -2
x = 6/(-2)
x = -3
x = -3
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