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(4*x+2)/10 = 13 // - 13
(4*x+2)/10-13 = 0
(4*x+2)/10+(-13*10)/10 = 0
4*x-13*10+2 = 0
4*x-128 = 0
(4*x-128)/10 = 0
(4*x-128)/10 = 0 // * 10
4*x-128 = 0
4*x-128 = 0 // + 128
4*x = 128 // : 4
x = 128/4
x = 32
x = 32
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