-1+2-3+(-5)= -7
-1+2 will be easier if it's like +2-1 or 2-1 = 1
While, -3 + (-5) will change the signs and be -3 - 5
The plus sign was chnanged into - and the negative sign of five was changed into positive....and the result was -8
When you combine 1 and -8....it will be 1-8 = -7
