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x in (-oo:+oo)
220 = (1/2)*x-12 // - (1/2)*x-12
12-((1/2)*x)+220 = 0
(-1/2)*x+12+220 = 0
232-1/2*x = 0 // - 232
-1/2*x = -232 // : -1/2
x = -232/(-1/2)
x = 464
x = 464
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