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