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-12 + (-7) = -15
b. -5 + (-23) + 7 =
-28 + 7 = -21
c. -50 + 11 + (-10) =
-39 + (-10) = -49
= (23+(-11)) + (-7)
= 12 + ( -7 )
= 5
b. -5 + (-23) + 7
= ( -5 + (-23)) + 7
=-28 + 7
=-21
c. -50 + 11 + (-10)
= ( -50 + 11 ) + (-10)
= -39 + (-10)
= -49