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3*x+x-x-(1/4)-(2/5)+1/2 = 13/8 // - 13/8
3*x+x-x-(1/4)-(2/5)+1/2-(13/8) = 0
3*x+x-x-1/4-2/5+1/2-13/8 = 0
3*x-71/40 = 0 // + 71/40
3*x = 71/40 // : 3
x = 71/40/3
x = 71/120
x = 71/120
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