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x in (-oo:+oo)
x-(3*x)+1 = -21 // + 21
x-(3*x)+1+21 = 0
x-3*x+1+21 = 0
22-2*x = 0 // - 22
-2*x = -22 // : -2
x = -22/(-2)
x = 11
x = 11
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