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(3*(2*x-3))/7 = -9 // + 9
(3*(2*x-3))/7+9 = 0
(3*(2*x-3))/7+(7*9)/7 = 0
3*(2*x-3)+7*9 = 0
6*x+54 = 0
(6*x+54)/7 = 0
(6*x+54)/7 = 0 // * 7
6*x+54 = 0
6*x+54 = 0 // - 54
6*x = -54 // : 6
x = -54/6
x = -9
x = -9
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