Answer:
x = 0
Step-by-step explanation: (remember a negative times a negative equals a positive!) (combine like terms!)
2 times 3x, plus 2 times 1; -7 times x, -7 times -1 = 9 - 4x
6x + 2 -7x + 7 = 9 - 4x
-x + 9 = 9 - 4x (add 4x to both sides)
3x +9 = 9 (subtract 9 form both nines)
3x = 0 (divide by 3 on both sides)
x = 0
I hope this helps, let me know if you need more help!