Answer:
-3
Explanation:
first you start with by adding 9 to both sides to balance
-2x+6x-9=15
+9 +9
Giving you -2x+6x=24 now you start by dividing
I started by dividing -2
-2x+6x=24
÷(-2) ÷(-2)
Giving you x+6x=(-12) again divide
x+6x=(-12)
÷6 ÷6
Giving you x+x=(-6) we know that x+x is = to 2x next we divide agian
2x=(-6)
÷2 ÷2
Giving you the answr x=(-3)