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(1/3)*(9*x+27)-4 = (1/2)*(2*x+54) // - (1/2)*(2*x+54)
(1/3)*(9*x+27)-((1/2)*(2*x+54))-4 = 0
(1/3)*(9*x+27)+(-1/2)*(2*x+54)-4 = 0
1/3*(9*x+27)-1/2*(2*x+54)-4 = 0
1/3*(9*x+27)-1/2*(2*x+54)-4 = 0
2*x-18-4 = 0
2*x-22 = 0
2*x-22 = 0
2*x-22 = 0 // + 22
2*x = 22 // : 2
x = 22/2
x = 11
x = 11
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