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x/4+x/10-(2/5) = x/20-(1/2) // - x/20-(1/2)
x/4+x/10-(x/20)-(2/5)+1/2 = 0
x/4+x/10-(x/20)-2/5+1/2 = 0
3/10*x+1/10 = 0 // - 1/10
3/10*x = -1/10 // : 3/10
x = -1/10/3/10
x = -1/3
x = -1/3
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