Answer
$n=-1$
Work Step by Step
$6(2n-1)+18=0$ $\longrightarrow$distributive property
$12n-6+18=0$ $\longrightarrow$combine like terms
$12n+12=0$ $\longrightarrow$addition property
$12n+12-12=0-12$ $\longrightarrow$combine like terms
$12n=-12$ $\longrightarrow$multiplication property
$12n\div12=-12\div12$ $\longrightarrow$simplify
$n=-1$
