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(2/3)*x-9 = (-2/3)*x-3 // - (-2/3)*x-3
(2/3)*x-((-2/3)*x)-9+3 = 0
(2/3)*x+(2/3)*x-9+3 = 0
4/3*x-6 = 0 // + 6
4/3*x = 6 // : 4/3
x = 6/4/3
x = 9/2
x = 9/2
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