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x in (-oo:+oo)
63 = (1/2)*x // - (1/2)*x
63-((1/2)*x) = 0
(-1/2)*x+63 = 0
63-1/2*x = 0 // - 63
-1/2*x = -63 // : -1/2
x = -63/(-1/2)
x = 126
x = 126
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