Question 484692
Rewrite LHS as (4a + 3) + (-3a) then using the fact that addition is associative, you can say the LHS is equal to (4a - 3a) + 3 = a + 3, same as RHS. That's if you want to prove they're equal.


In reality though, we just say (4a + 3) - 3a is equal to a + 3 right off the back.