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(2*x+18)/4 = 11 // - 11
(2*x+18)/4-11 = 0
(2*x+18)/4+(-11*4)/4 = 0
2*x-11*4+18 = 0
2*x-26 = 0
(2*x-26)/4 = 0
(2*x-26)/4 = 0 // * 4
2*x-26 = 0
2*x-26 = 0 // + 26
2*x = 26 // : 2
x = 26/2
x = 13
x = 13
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