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x in (-oo:+oo)
(-2/3)*((1/2)*x+12) = 6 // - 6
(-2/3)*((1/2)*x+12)-6 = 0
-2/3*(1/2*x+12)-6 = 0
-2/3*(1/2*x+12)-6 = 0
-1/3*x-14 = 0
-1/3*x-14 = 0
-1/3*x-14 = 0 // + 14
-1/3*x = 14 // : -1/3
x = 14/(-1/3)
x = -42
x = -42
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