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x in (-oo:+oo)
4*x-1 = 12/5 // - 12/5
4*x-(12/5)-1 = 0
4*x-12/5-1 = 0
4*x-17/5 = 0 // + 17/5
4*x = 17/5 // : 4
x = 17/5/4
x = 17/20
x = 17/20
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