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a in (-oo:+oo)
(2-(3*a))/4 > 5 // - 5
(2-(3*a))/4-5 > 0
(2-3*a)/4-5 > 0
(2-3*a)/4+(-5*4)/4 > 0
2-3*a-5*4 > 0
-3*a-18 > 0
(-3*a-18)/4 > 0
(-3*a-18)/4 > 0 // * 4^2
4*(-3*a-18) > 0
( -3*a-18 )
-3*a-18 > 0 // + 18
-3*a > 18 // : -3
a < 18/(-3)
a < -6
( 4 )
4 > 0
a należy do R
(-oo:-6) (-6:+oo) -3*a-18 + - 4 + +
a in (-oo:-6)
(-oo:-6)
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