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(1/3)*(3*x+9) = (4/9)*(6*x-9) // - (4/9)*(6*x-9)
(1/3)*(3*x+9)-((4/9)*(6*x-9)) = 0
(1/3)*(3*x+9)+(-4/9)*(6*x-9) = 0
1/3*(3*x+9)-4/9*(6*x-9) = 0
1/3*(3*x+9)-4/9*(6*x-9) = 0
7-5/3*x = 0
7-5/3*x = 0
7-5/3*x = 0 // - 7
-5/3*x = -7 // : -5/3
x = -7/(-5/3)
x = 21/5
x = 21/5
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