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(9*x-15)/4 = 3 // - 3
(9*x-15)/4-3 = 0
(9*x-15)/4+(-3*4)/4 = 0
9*x-3*4-15 = 0
9*x-27 = 0
(9*x-27)/4 = 0
(9*x-27)/4 = 0 // * 4
9*x-27 = 0
9*x-27 = 0 // + 27
9*x = 27 // : 9
x = 27/9
x = 3
x = 3
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