You can put this solution on YOUR website! By meaning more than one variable on one side I figure that you mean the same variable.
For example: let x be the the variable.
4x+7-3x=47
If you have two variables on the same side you take them and either add or subtract them.
So 4x-3x. In this case you subtract and you get x by itself.
x+7=47
Now you subtract 7 from both sides
x+7=47
-7 -7
---------
x=40