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First, you must

The first number is -15, so keep it.

We now have:

-15

Second, you must

The sign is +, so we must make it - .

We now have

-15 -

Third, you must

The second number is +20, so it is positive, we'll change it to negative, so it becomes -20.

We finally have

-15 - (-20)

Lastly, we must do the operation based on the sign. Apply

-15 - (-20)

it is like you are paying the money you borrowed, which is 15, and you pay 20. Now your change is going to be five.

-15 - (20) = +5 or simply 5

Because in adding integers we should add it normally if it is a like sign. For example.....

+20 (+) +35= +55 or 55

-60 (+) -54= -114

And in adding unlike signs we should just subtract it. Then copy the sign of largest number. For example............

-38 (+) +10= -28

-60 (+) +97= +37 or 37