a. n + 21 = 16
n = 16 - 21
n = -5
b. 65 + n = 13
n = 13 - 65
n = -52
c. n - (-8) = 17
n = 17 + (-8)
n = 17 - 8
n = 9
d. (-5) + n = 7
n = 7 - (-5)
n = 7 + 5
n = 12
e. n - 6 = -5
n = -5 + 6
n = 1
f. n - 53 = -45
n = -45 + 53
n = 8
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a. n + 21 = 16
n = 16 - 21
n = -5
b. 65 + n = 13
n = 13 - 65
n = -52
c. n - (-8) = 17
n = 17 + (-8)
n = 17 - 8
n = 9
d. (-5) + n = 7
n = 7 - (-5)
n = 7 + 5
n = 12
e. n - 6 = -5
n = -5 + 6
n = 1
f. n - 53 = -45
n = -45 + 53
n = 8