It really depends what the equation looks like. For example, if the variable is added to other expressions, you can subtract the variable on both sides. Here is an example:3x + 3 = 2x + 10
If you subtract 2x from both sides, you'll end up having the variable only on one side.
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You try to rearrange the question so that the variable is all on the same side.
However, that may not always be possible. For example, in the following equation: x^3 = sin(x) + 2, it is not possible to bring all the x-terms to one side. In such a case, you try an iterative procedure.
The variables may have different values.
You first have to get rid of the numbers that don't have variables. then you divide by the variable and solve for it.
2
+6
It means that you manipulate the equation in such a way that the variable appears only on one side, by itself.