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x in (-oo:+oo)
x-(3*x)+6 = -14 // + 14
x-(3*x)+6+14 = 0
x-3*x+6+14 = 0
20-2*x = 0 // - 20
-2*x = -20 // : -2
x = -20/(-2)
x = 10
x = 10
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