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x in (-oo:+oo)
60 = (1/2)*x // - (1/2)*x
60-((1/2)*x) = 0
(-1/2)*x+60 = 0
60-1/2*x = 0 // - 60
-1/2*x = -60 // : -1/2
x = -60/(-1/2)
x = 120
x = 120
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