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4*x-(2/5) = (4/5)*x // - (4/5)*x
4*x-((4/5)*x)-(2/5) = 0
4*x+(-4/5)*x-2/5 = 0
16/5*x-2/5 = 0 // + 2/5
16/5*x = 2/5 // : 16/5
x = 2/5/16/5
x = 1/8
x = 1/8
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