a+8=12
t+(-3)=8
You have .
If two things are equal if you take the same thing from both the two results
are still equal.
So here we take (subtract) form and also from , and the two results will be equal:
which gives:
.
This is the same thing as:t+(-3)=8
Here we do the same sort of thing, we add to and to get:
which gives:
RonL