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x in (-oo:+oo)
6*(9-x) = 42 // - 42
6*(9-x)-42 = 0
6*(9-x)-42 = 0
12-6*x = 0
12-6*x = 0
12-6*x = 0 // - 12
-6*x = -12 // : -6
x = -12/(-6)
x = 2
x = 2
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