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(1/3)*(6*x-9) = 13-2*x // - 13-2*x
(1/3)*(6*x-9)-(-2*x)-13 = 0
(1/3)*(6*x-9)+2*x-13 = 0
1/3*(6*x-9)+2*x-13 = 0
1/3*(6*x-9)+2*x-13 = 0
4*x-13-3 = 0
4*x-16 = 0
4*x-16 = 0
4*x-16 = 0 // + 16
4*x = 16 // : 4
x = 16/4
x = 4
x = 4
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