Answer: x= -3
Step-by-step explanation:
There are multiple ways to solve this, but since you are given multiple choices, you could just plug the answers and solve to see if both sides of the equation will equal.
For example: If I plug in the third choice x= -3 for every x
1/3(9x-15)+2/5(10x+15)= -20
1/3{(9)(-3)-15)+2/5{(10)(-3)+15)= -20
1/3{-27-15)+2/5(-30+15)= -20
1/3(-42) + 2/5(-15)= -20
-14+ (-30/5)= -20
-14+(-6)= -20
-20 = -20
Answer is x= -3
