a:-57
b:14
c:-32
d:117
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= -70 + 13
= -57
b. (-15+6) +23
= -9 + 23
= 14
c. (45+4) -17
= 49 - 17
= 32
d. (27+18) -72
= 45 - 72
= -27
a:-57
b:14
c:-32
d:117