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In adding integers, we must remember this steps. First, you must keep the first number. The first number is -15, so keep it. We now have: -15 Second, you must flip the sign, addition sign will be subtraction sign and vice versa. The sign is +, so we must make it - . We now have -15 - Third, you must change the sign of the second number, positive becomes negative and vice versa. The second number is +20, so it is positive, we'll change it to negative, so it becomes -20. We finally have -15 - (-20) Lastly, we must do the operation based on the sign. Apply common sense. -15 - (-20) it is like you are paying the money you borrowed, which is 15, and you pay 20. Now your change is going to be five. -15 - (20) = +5 or simply 5
5 is the answer. Because in adding integers we should add it normally if it is a like sign. For example..... +20 (+) +35= +55 or 55 -60 (+) -54= -114 And in adding unlike signs we should just subtract it. Then copy the sign of largest number. For example............ -38 (+) +10= -28 -60 (+) +97= +37 or 37
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