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(2/3)*(9-x) = 3 // - 3
(2/3)*(9-x)-3 = 0
2/3*(9-x)-3 = 0
2/3*(9-x)-3 = 0
3-2/3*x = 0
3-2/3*x = 0
3-2/3*x = 0 // - 3
-2/3*x = -3 // : -2/3
x = -3/(-2/3)
x = 9/2
x = 9/2
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