Weegy: First you will want to take the 5 and multiply it to the -3X and 4 so it will look like this:
7X -15X-20=-21-7X Got it?
Then you will combine the X's on the first side so you will get this:
Next you need to get the X's on [ [ [ one side so you will take the one that is less, in this case -8X and add it to the -7X. When it crosses over the equal mark it becomes a positive so you will get this next:
-20=-21 + X ... (More)