Answer:
Use the image as an example
Step-by-step explanation:
Use this image as an example to solve it may help.
Hopefully this helps:)
Not sure if the equation is

or








On the other side of the equation, we'd get

Then

- If it's the second one instead, you can use the same strategy as above:


(Note that this step assume
)



Then we get

The answer is 40
91+49=140
180-140=40