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