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x in (-oo:+oo)
5-((1/2)*x) = 12 // - 12
5-((1/2)*x)-12 = 0
(-1/2)*x-12+5 = 0
-1/2*x-7 = 0 // + 7
-1/2*x = 7 // : -1/2
x = 7/(-1/2)
x = -14
x = -14
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