Question 550195
Do the opposite of whatever is being done to the variable.  For example, if it's:
x+5=10
Subtract 5 from both sides.  If it were x-5=10 then add 5 to both sides for x=15.<P>

If x is multiplied by something, divide both sides by it. 5x=10 gives x=2.<P>
If x is divided by something, multiply both sides by it. x/5=10 gives x=20.<P>
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