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x in (-oo:+oo)
(2/3)*(4-x) = 2*x // - 2*x
(2/3)*(4-x)-(2*x) = 0
(2/3)*(4-x)-2*x = 0
2/3*(4-x)-2*x = 0
2/3*(4-x)-2*x = 0
8/3-8/3*x = 0
8/3-8/3*x = 0
8/3-8/3*x = 0 // - 8/3
-8/3*x = -8/3 // : -8/3
x = -8/3/(-8/3)
x = 1
x = 1
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