Answer
$z\lt13$
Work Step by Step
$6z-15\lt4z+11$
Add 15 to both sides: $6z-15+15\lt4z+11+15$
Simplify: $6z\lt4z+26$
Subtract 4z from both sides $6z-4z\lt4z-4z+26$
Simplify: $2z\lt26$
Divide both sides by 2: $\frac{2z}{2}\lt\frac{26}{2}$
Simplify: $z\lt13$