We need to "get rid of" the -6 on the left hand side so we are left with x only on the left hand side.

The opposite of subtracting 6 is adding 6.

If we add 6 to both sides, we will remove the -6 on the left.

x − 6 = 10

x − 6 + 6 = 10 + 6

x = 16

So the value of x needs to be 16 to make the equation true.

CHECK into the original question:

16 − 6 = 10. It checks out okay.