Answer
$x=-7$
Work Step by Step
$2x+10+3x=-12-x-20$ $\longrightarrow$simplify
$5x+10=-32-x$ $\longrightarrow$addition property
$5x+10-10+x=-32-x-10+x$ $\longrightarrow$simplify
$6x=-42$ $\longrightarrow$ multiplication property
$6x\div6=-42\div6$ $\longrightarrow$simplify
$x=-7$