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x in (-oo:+oo)
15*x-(20*(2*x-(1/5))) = 1 // - 1
15*x-(20*(2*x-(1/5)))-1 = 0
15*x-20*(2*x-1/5)-1 = 0
15*x-20*(2*x-1/5)-1 = 0
4-25*x-1 = 0
3-25*x = 0
3-25*x = 0
3-25*x = 0 // - 3
-25*x = -3 // : -25
x = -3/(-25)
x = 3/25
x = 3/25
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