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(5*x+1)/2-3 = 20 // - 20
(5*x+1)/2-20-3 = 0
(5*x+1)/2+(-20*2)/2+(-3*2)/2 = 0
5*x-20*2-3*2+1 = 0
5*x-39-6 = 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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