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x in (-oo:+oo)
x/3+2 = 2*x-4 // - 2*x-4
x/3-(2*x)+2+4 = 0
x/3-2*x+2+4 = 0
6-5/3*x = 0 // - 6
-5/3*x = -6 // : -5/3
x = -6/(-5/3)
x = 18/5
x = 18/5
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