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(9*(3*x+4))/4 = 36 // - 36
(9*(3*x+4))/4-36 = 0
(9*(3*x+4))/4+(-36*4)/4 = 0
9*(3*x+4)-36*4 = 0
27*x-108 = 0
(27*x-108)/4 = 0
(27*x-108)/4 = 0 // * 4
27*x-108 = 0
27*x-108 = 0 // + 108
27*x = 108 // : 27
x = 108/27
x = 4
x = 4
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