-3/4x<-6
Divide both sides by -3/4.
You get x>8.
Im not sure about your question.
if the question is -3/4x < -6
then -3 < -24x
3 > 24x
3/24 > x
x < 1/8
if the question is -3/4 x < -6
that means -3x / 4 < -6
-3x < -24
3x > 24
x>8
All the best!