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x in (-oo:+oo)
31 = (1/2)*x // - (1/2)*x
31-((1/2)*x) = 0
(-1/2)*x+31 = 0
31-1/2*x = 0 // - 31
-1/2*x = -31 // : -1/2
x = -31/(-1/2)
x = 62
x = 62
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