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