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z in (-oo:+oo)
(3*z-2)/(-5) < 6 // - 6
(3*z-2)/(-5)-6 < 0
(3*z-2)/(-5)+(-6*(-5))/(-5) < 0
3*z-6*(-5)-2 < 0
3*z+28 < 0
(3*z+28)/(-5) < 0
(3*z+28)/(-5) < 0 // * (-5)^2
-5*(3*z+28) < 0
( -5 )
-5 < 0
z należy do R
( 3*z+28 )
3*z+28 < 0 // - 28
3*z < -28 // : 3
z < -28/3
(-oo:-28/3) (-28/3:+oo) -5 - - 3*z+28 - +
z in (-28/3:+oo)
(-28/3:+oo)
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