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3*x+x+36/6+1/5 = 13 // - 13
3*x+x+36/6+1/5-13 = 0
4*x-34/5 = 0 // + 34/5
4*x = 34/5 // : 4
x = 34/5/4
x = 17/10
x = 17/10
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