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x in (-oo:+oo)
16 = 3*x-x-2 // - 3*x-x-2
x-(3*x)+2+16 = 0
x-3*x+2+16 = 0
18-2*x = 0 // - 18
-2*x = -18 // : -2
x = -18/(-2)
x = 9
x = 9
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