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If you have x in an expression, then you can't solve for x.
It depends on the equation you have when solving for x. Whatever equation you have, you'd usually isolate x to one side of the equation with all other terms on the other side.
For example,
3x + 6 = 12.
To solve for x, you'd subtract 6 then divide 3 from both sides:
3x + 6 - 6 = 12 - 6
3x = 6
3x/3 = 6/3
After simplifying, your final answer would be x = 2 for this sample equation.
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