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n in (-oo:+oo)
4*n-(3/5) < (3*(n-1))/4 // - (3*(n-1))/4
4*n-((3*(n-1))/4)-(3/5) < 0
(-3/4)*(n-1)+4*n-3/5 < 0
4*n-3/4*(n-1)-3/5 < 0
(-3/4*5*(n-1))/5+(4*5*n)/5-3/5 < 0
4*5*n-3/4*5*(n-1)-3 < 0
65/4*n-3+15/4 < 0
65/4*n+3/4 < 0
(65/4*n+3/4)/5 < 0
(65/4*n+3/4)/5 < 0 // * 5^2
5*(65/4*n+3/4) < 0
( 5 )
5 < 0
n belongs to the empty set
( 65/4*n+3/4 )
65/4*n+3/4 < 0 // - 3/4
65/4*n < -3/4 // : 65/4
n < -3/4/65/4
n < -3/65
(-oo:-3/65) (-3/65:+oo) 5 + + 65/4*n+3/4 - +
n in (-oo:-3/65)
(-oo:-3/65)
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