2015-09-29T22:23:10+08:00

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-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

• Brainly User
2015-09-30T12:09:41+08:00

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A + b + c + d

(-1) + (2) - (3) + (-5) = N
(-1) + (-5) - (3) + 2= N
- 9+ 2 = -7