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x in (-oo:+oo)
(2/3)*(9-x) = (1/3)*x // - (1/3)*x
(2/3)*(9-x)-((1/3)*x) = 0
(2/3)*(9-x)+(-1/3)*x = 0
2/3*(9-x)-x/3 = 0
(2/3*3*(9-x))/3-x/3 = 0
2/3*3*(9-x)-x = 0
18-3*x = 0
(18-3*x)/3 = 0
(18-3*x)/3 = 0 // * 3
18-3*x = 0
18-3*x = 0 // - 18
-3*x = -18 // : -3
x = -18/(-3)
x = 6
x = 6
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