Ok, if you have a plus and a minus the minus counts, eg. 5+-3= 2 not 8, because +- is like adding a negative. And if it's the other way round eg 5-+3=2 because the plus can be left away, if there's a minus before it the plus just confirms that the 3 is positive.
So for this in words, your acount is down by seven, and another 18 are positive are taken away, you now owe 25, so (-7)-(+18)= -25 hope this helps a bit.
Answers & Comments
Verified answer
Ok, if you have a plus and a minus the minus counts, eg. 5+-3= 2 not 8, because +- is like adding a negative. And if it's the other way round eg 5-+3=2 because the plus can be left away, if there's a minus before it the plus just confirms that the 3 is positive.
So for this in words, your acount is down by seven, and another 18 are positive are taken away, you now owe 25, so (-7)-(+18)= -25 hope this helps a bit.
-(+ N) = - N
so
(-7) + (-18) = -25