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x in (-oo:+oo)
3-3*x = 3*x-3 // - 3*x-3
3-3*x-(3*x)+3 = 0
3-3*x-3*x+3 = 0
6-6*x = 0 // - 6
-6*x = -6 // : -6
x = -6/(-6)
x = 1
x = 1
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