The equation above is quite simple to solve. It's pretty basic math. The main idea to this problem is to isolate the variable. In this case, the variable is "x". In other words, we need to get "x" by itself.
The first step is to add 7 to both sides. Why? To cancel out the 7 by adding 7 to a -7. That will make it 0. Because we're adding to both sides, you'll need to add 7 to 15; that gives you 22.
The next step is to begin to isolate the variable. The new equation is 2x=22, just for clarification. Now, this is the easy part. You'll divide 2 by the 2 to the left of the variable. Do the same to the other side, and there you go! The variable equals
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