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x in (-oo:+oo)
(-1/2)*(x-12)-(2*x) = 4 // - 4
(-1/2)*(x-12)-(2*x)-4 = 0
(-1/2)*(x-12)-2*x-4 = 0
-1/2*(x-12)-2*x-4 = 0
-1/2*(x-12)-2*x-4 = 0
6-5/2*x-4 = 0
2-5/2*x = 0
2-5/2*x = 0
2-5/2*x = 0 // - 2
-5/2*x = -2 // : -5/2
x = -2/(-5/2)
x = 4/5
x = 4/5
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