Question

If we subtract the same number from both sides of __________ it still holds.

Answer 1

Let's suppose $a=4$ is our equation.

Now when we subtract $3$ from both sides.

We get $a-3=4-3$

$a-3=1$

$a=4$ which is same as that of starting equation.

Hence, if we subtract the same number from both sides of equation it still holds.