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(3/4)*(4*x-3) = 9 // - 9
(3/4)*(4*x-3)-9 = 0
3/4*(4*x-3)-9 = 0
3/4*(4*x-3)-9 = 0
3*x-45/4 = 0
3*x-45/4 = 0
3*x-45/4 = 0 // + 45/4
3*x = 45/4 // : 3
x = 45/4/3
x = 15/4
x = 15/4
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