Answer
$3x=2(x+5)$
$x=10$
Work Step by Step
"Product" indicates multiplication. "Twice" indicates multiplication by 2. "Sum" indicates addition.
$3x=2(x+5)$ $\longrightarrow$distributive property
$3x=2x+10$ $\longrightarrow$addition property
$3x-2x=2x+10-2x$ $\longrightarrow$simplify
$x=10$