To solve for this, we need to use the Distributive Property, which allows us to multiply the number/variable outside of the parenthesis by all numbers/variables inside of the parenthesis. Once we've done that, we can attempt to simplify the equation. Our current equation is: 7a + 3(9+5a) = 0 Let's use the Distributive Property. 3(9 + 5a) 3(9) + 3(5a) 27 + 15a Our current equation now is: 7a + 27 + 15a = 0 Combine like-terms. 15a + 7a = 22a 22a + 27 (If this is not being solved, THIS is your answer as an expression) Subtract 27 from both sides 22a = -27 Divide both sides by 22 to get a. a = -27/22. If we are not solving for a, but getting an expression, your answer is: 22a + 27. If we are solving for a, our answer is: a = -27/22. I hope this helps!
