How do you do x-10 equals 3?

Answer 1

move the -10 onto the other side and swap the sign

x=3+10

x=13

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My version is basically the same as above, but...

x-10=3

First you would add 10 to both sides. This balances out the fact that in the equation you are subtracting. It the equation was x+10 you would subtract 10. Add.

x-10=3

+10 +10

x=13

So your answer is that X is 13.