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x in (-oo:+oo)
126 = 12*(1/2)*x // - 12*(1/2)*x
126-(12*(1/2)*x) = 0
126-6*x = 0
126-6*x = 0 // - 126
-6*x = -126 // : -6
x = -126/(-6)
x = 21
x = 21
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