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(1/3)*(6*x+24)-20 = (1/4)*(12*x-72) // - (1/4)*(12*x-72)
(1/3)*(6*x+24)-((1/4)*(12*x-72))-20 = 0
(1/3)*(6*x+24)+(-1/4)*(12*x-72)-20 = 0
1/3*(6*x+24)-1/4*(12*x-72)-20 = 0
1/3*(6*x+24)-1/4*(12*x-72)-20 = 0
26-x-20 = 0
6-x = 0
6-x = 0
6-x = 0 // - 6
-x = -6 // * -1
x = 6
x = 6
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