i need help!!
I assume in this question that you're trying to solve for x.
Start by simplifying the equation until you have all the x's on one side:
-2x + 4x - 6 = 12 (Here, you are adding 4x to both sides, therefore getting rid of it on the right side)
Then, combine all the x's until you have just one x:
2x - 6 = 12
Move everything that doesn't have an x attached to it to the other side:
2x = 12 + 6 (Add 6 to both sides)
Then combine like before:
2x = 18
Finally, divide by the coefficient of x:
x = 18/2 = 9