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x in (-oo:+oo)
61 = (1/2)*x // - (1/2)*x
61-((1/2)*x) = 0
(-1/2)*x+61 = 0
61-1/2*x = 0 // - 61
-1/2*x = -61 // : -1/2
x = -61/(-1/2)
x = 122
x = 122
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