So first thing first you have to make your 2 step equation into a one step so you simply subtract the 7 to both sides of the equation so now the 7 is canceled out and you are stuck with 2x=-10 so now your plan is to get "x" by itself so you would divide both sides by 2 so then the 2 cancels out and then -10 divided by 2 is -5 so now your answer would be: x=-5.
For an example on how i did it check the attachment!
~Good Luck!~
