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:
-8X-20= -21-7X
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 <------you get 1X here but it is not necessary to put the 1
Next you want to get the X by itself so you will add the-21 (because it is the lowest) to the other side. Again, when you cross a negative to the other side it becomes a positive. So here is your final result:
1=X
Hope that helped!
] ] ] Expert answered|TheSmartDiva|Points 31|

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