When you are doing maths, you must see the equations as numbers.
So 5-1 consists from the numbers +5 and -1. So 5-1=-1+5
however if you substract with a negative number you actually substract With -1
So 5--1, becomes 5+1.
See it as I have a bucket of -ses and +ses. When I removeone - the sum of +ses is greater than the sum of the -ses
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When you are using non-standard definitions of "plus" and "minus", or of "equal".
4
2
Answer : 130
They equal a minus and two +'s or two -'s equal a + :)