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Daphne F. | Patient, highly qualified tutor for a variety of subjectsPatient, highly qualified tutor for a va...

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