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(-3)-(-9) = ( -3 ) + 9 = 6
6-(-4) = 6 + 4 = 10
(-12)-8 = -20
7-13 = -6
b)
(-2) -10 = -12
(-12)-(-8) = -12 +8 = -4
(-9)-(-6) = ( -9) + 6 = -3
(-8)-2 =-10
c)
12 -(12) =12 + 12 = 24
(-20) - (-20) = ( -20) + 20 = 0
(-44)-50 = -94
(-42) - 30 = -72
d)
(-40) - (-30) = ( -40) + 30 = -10
(-130) -70 = -200
510 - (-10 ) = 510 + 10 = 520
(-120 ) - (200 ) = ( -120 ) + 200 = 80