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