If I understand your questions correctly, the first is "Something minus positive 5 equals positive 35," and "Something minus negative 5 equals positive 35." So let's call "something" the unknown value of x, so the equations would look like

1a) x - (+5) = (+35)

1b) x - 5 = 35

1c) x = 40

and

2a) x - (-5) = (+35)

2b) x + 5 = 35

2c) x = 30

What is a related sentences for this equation?

a - +5 =+35

Hmmmm... Maria came out of the house with x amount, she spent 5 dollars on some chips and now she has $35 left, how much did she start with?

Do you mean a minus a positive 5 and it will equal to a positive 35.

If that is so, then it is simple, you need to find the unknown (a) by making it as a subject and removing other numbers to one side like this:

a-(+5)=+35

a-5=+35

a=+35+5

= +40

So, a equals to a positive 40/ plus 40