-3 +X=10

To solve the equation -3 + X = 10, you need to isolate the variable X.

Starting with -3 + X = 10, you can first isolate X by adding 3 to both sides of the equation:

-3 + X + 3 = 10 + 3

This simplifies to:

X = 13

So, the value of X is 13.