## Elementary Algebra

$10x+74$
We start with the given expression: $3(x+6)+7(x+8)$ We use the distributive property to expand the expression: $3x+18+7x+56$ We use the commutative and associative properties to group like terms: $3x+7x+18+56$ We combine the like terms using addition: $(3+7)x+18+56=10x+74$