1.)negative - negative = positive
-5-(-7) (multiply - and -7 because it cant have two signs.thats to confusing right so multiply it) [negative times negative equals positive] => -5+7=2[the number with greater value/number/amount determines the sign of the final answer] => 7 or +(positive)7 is greater than -5 so the final answer is positive.
2.)like number 1 the sign of the final answer depends on the the number with greater value.)
positive - negative = depends
5-8=-3(subtract then the sign depends on the number with greater value/number
3.)negative - negative =positive
I hope it helps. :)