Question

Solve the equation 3(-a-3)-2(3a+3)=-78

Answer 1

Given equation is 3(-a-3)-2(3a+3)=-78

we can start by distributing numbers which are outside parenthesis

3(-a-3)-2(3a+3)=-78

-3a-9-6a-6=-78

combine like terms

-9a-15=-78

-9a=-78+15

-9a=-63

a=-63/-9

a=7

Hence final answer is a=7.

Answer 2

We are given this equation:

3(-a-3)-2(3a+3)=-78

We will use distributive property here :

a(b+c) =a*b +a*c

-3a-9 -6a-6=-78

combining like terms

-9a - 15 =-78

we add 15 to both sides

-9a -15 +15 = -78+15

-9a =-63

dividing both sides by -9

a=7