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x in (-oo:+oo)
4-((1/2)*x) = 12 // - 12
4-((1/2)*x)-12 = 0
(-1/2)*x-12+4 = 0
-1/2*x-8 = 0 // + 8
-1/2*x = 8 // : -1/2
x = 8/(-1/2)
x = -16
x = -16
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