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x in (-oo:+oo)
(2/3)*(6-x) = (5/6)*x // - (5/6)*x
(2/3)*(6-x)-((5/6)*x) = 0
(2/3)*(6-x)+(-5/6)*x = 0
2/3*(6-x)+(-5*x)/6 = 0
(2/3*6*(6-x))/6+(-5*x)/6 = 0
2/3*6*(6-x)-5*x = 0
24-9*x = 0
(24-9*x)/6 = 0
(24-9*x)/6 = 0 // * 6
24-9*x = 0
24-9*x = 0 // - 24
-9*x = -24 // : -9
x = -24/(-9)
x = 8/3
x = 8/3
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