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Verified answer
A. p + 29 = 51p = 51 - 29
p = 22
B. p + (-57) = 45
p = 45 + 57
p = 102
C. 29 + (-p) = 32
-p = 32 - 29
-p = 3
p = -3
D. (-61) + p = 56
p = 56 + 61
p = 117
p + 29 = 51
p = 51 - 29
p = 22
B.
p + (-57) = 45
p - 57 = 45
p = 45 + 57
p = 102
C.
29 + (-p) = 32
29 - p = 32
p = 29 - 32
p = -3
D.
(-61) + p = 56
p = 56 + 61
p = 117