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(1/2)*(4*x+8) = (1/3)*(9*x-15) // - (1/3)*(9*x-15)
(1/2)*(4*x+8)-((1/3)*(9*x-15)) = 0
(1/2)*(4*x+8)+(-1/3)*(9*x-15) = 0
1/2*(4*x+8)-1/3*(9*x-15) = 0
1/2*(4*x+8)-1/3*(9*x-15) = 0
9-x = 0
9-x = 0
9-x = 0 // - 9
-x = -9 // * -1
x = 9
x = 9
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