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(2/3)*(x-9) = 15-x // - 15-x
(2/3)*(x-9)+x-15 = 0
2/3*(x-9)+x-15 = 0
2/3*(x-9)+x-15 = 0
5/3*x-15-6 = 0
5/3*x-21 = 0
5/3*x-21 = 0
5/3*x-21 = 0 // + 21
5/3*x = 21 // : 5/3
x = 21/5/3
x = 63/5
x = 63/5
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