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x in (-oo:+oo)
(1/3)*(9*x-12) = 4*x-9 // - 4*x-9
(1/3)*(9*x-12)-(4*x)+9 = 0
(1/3)*(9*x-12)-4*x+9 = 0
1/3*(9*x-12)-4*x+9 = 0
1/3*(9*x-12)-4*x+9 = 0
9-x-4 = 0
5-x = 0
5-x = 0
5-x = 0 // - 5
-x = -5 // * -1
x = 5
x = 5
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