What is 2a plus 45 equals 5a?

Answer 1

It is an equation because it is telling us that one thing is equal to another. We solve for the value of a like this:

2a + 45 = 5a

If we subtract 2a from both sides of the equation (from both sides in order to keep things equal) we get:

45 = 5a - 2a

We can now simplify the right side of the equation by calculating 5a - 2a to get:

45 = 3a

It reads better to write this as 3a = 45.

Now if we divide both sides of the equation by 3 we will end up with "a" on one side:

a = 45/3

a = 15.