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(2/3)*(9*x+15) = (1/4)*(8*x-24) // - (1/4)*(8*x-24)
(2/3)*(9*x+15)-((1/4)*(8*x-24)) = 0
(2/3)*(9*x+15)+(-1/4)*(8*x-24) = 0
2/3*(9*x+15)-1/4*(8*x-24) = 0
2/3*(9*x+15)-1/4*(8*x-24) = 0
4*x+16 = 0
4*x+16 = 0
4*x+16 = 0 // - 16
4*x = -16 // : 4
x = -16/4
x = -4
x = -4
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