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y in (-oo:+oo)
(3*(5-y))/5 > -6*y // + -6*y
(3*(5-y))/5-(-6*y) > 0
(3*(5-y))/5+6*y > 0
(3*(5-y))/5+(5*6*y)/5 > 0
3*(5-y)+5*6*y > 0
27*y+15 > 0
(27*y+15)/5 > 0
(27*y+15)/5 > 0 // * 5^2
5*(27*y+15) > 0
( 27*y+15 )
27*y+15 > 0 // - 15
27*y > -15 // : 27
y > -15/27
y > -5/9
( 5 )
5 > 0
y należy do R
(-oo:-5/9) (-5/9:+oo) 27*y+15 - + 5 + +
y in (-5/9:+oo)
(-5/9:+oo)
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