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x in (-oo:+oo)
9-6*x = 6*x-135 // - 6*x-135
9-6*x-(6*x)+135 = 0
9-6*x-6*x+135 = 0
144-12*x = 0 // - 144
-12*x = -144 // : -12
x = -144/(-12)
x = 12
x = 12
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