0
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.
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