Answer
$10-3(2x+3y)=10-6x-9y$
Work Step by Step
$10-3(2x+3y)$
Multiply $3$ by every term inside the parentheses:
$10-3(2x+3y)=10-6x-9y$
There are no like terms in the resulting expression, so we leave said expression as the answer to this problem.