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x in (-oo:+oo)
(2*x)/3+4 = 2*x-4 // - 2*x-4
(2*x)/3-(2*x)+4+4 = 0
(2*x)/3-2*x+4+4 = 0
8-4/3*x = 0 // - 8
-4/3*x = -8 // : -4/3
x = -8/(-4/3)
x = 6
x = 6
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