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x in (-oo:+oo)
x/3 = 2*x+4 // - 2*x+4
x/3-(2*x)-4 = 0
x/3-2*x-4 = 0
-5/3*x-4 = 0 // + 4
-5/3*x = 4 // : -5/3
x = 4/(-5/3)
x = -12/5
x = -12/5
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