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x in (-oo:+oo)
12-((1/2)*x) = 124 // - 124
12-((1/2)*x)-124 = 0
(-1/2)*x-124+12 = 0
-1/2*x-112 = 0 // + 112
-1/2*x = 112 // : -1/2
x = 112/(-1/2)
x = -224
x = -224
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