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1.a-( -b) =a+b
a.a=75. b=84
75-(-84)
=75+84
=159
b. a=118. b=125
118-(-125)
=118+125
= 143
c. a=25 b=30
25-(-30)
=25+30
=55
2. a.sum is -3
=(-8 ,-5) , (-7,4)
b. sum is 0
= (-3,3) ,. (-5,5)
c. difference is 2
= (-5,-3) , (1,-1)
d. difference is(-5)
= (-4,-9) , (-8, -3)
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