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
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:
So, a equals to a positive 40/ plus 40