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x in (-oo:+oo)
3*x-(1/4) = 2/5 // - 2/5
3*x-(1/4)-(2/5) = 0
3*x-1/4-2/5 = 0
3*x-13/20 = 0 // + 13/20
3*x = 13/20 // : 3
x = 13/20/3
x = 13/60
x = 13/60
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