Algebra 1

$z\lt13$
$6z-15\lt4z+11$ $\longrightarrow$ add 15 to both sides; subtract 4z from both sides $6z-15+15-4z\lt4z+11+15-4z$ $\longrightarrow$combine like terms $2z\lt26$ $\longrightarrow$ divide both sides by 2 $2z\div2\lt26\div 2$ $\longrightarrow$ simplify $z\lt13$