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x in (-oo:+oo)
1-2*x = 3*x+11 // - 3*x+11
1-2*x-(3*x)-11 = 0
1-2*x-3*x-11 = 0
-5*x-10 = 0 // + 10
-5*x = 10 // : -5
x = 10/(-5)
x = -2
x = -2
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