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x in (-oo:+oo)
72 = (1/2)*x // - (1/2)*x
72-((1/2)*x) = 0
(-1/2)*x+72 = 0
72-1/2*x = 0 // - 72
-1/2*x = -72 // : -1/2
x = -72/(-1/2)
x = 144
x = 144
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