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(5*x+1)/2 = 23 // - 23
(5*x+1)/2-23 = 0
(5*x+1)/2+(-23*2)/2 = 0
5*x-23*2+1 = 0
5*x-45 = 0
(5*x-45)/2 = 0
(5*x-45)/2 = 0 // * 2
5*x-45 = 0
5*x-45 = 0 // + 45
5*x = 45 // : 5
x = 45/5
x = 9
x = 9
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