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(2/3)*(9-(4*x)) = (1/4)*x+6 // - (1/4)*x+6
(2/3)*(9-(4*x))-((1/4)*x)-6 = 0
(2/3)*(9-4*x)+(-1/4)*x-6 = 0
2/3*(9-4*x)-x/4-6 = 0
(2/3*4*(9-4*x))/4-x/4+(-6*4)/4 = 0
2/3*4*(9-4*x)-x-6*4 = 0
24-35/3*x-24 = 0
-35/3*x = 0
(-35/3*x)/4 = 0
(-35/3*x)/4 = 0 // * 4
(-35*x)/3 = 0
-35/3*x = 0 // : -35/3
x = 0
x = 0
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