Explanation:
A no
n + 7 = 16
n + 7 - 7 = 16 - 7
n = 9
that is not n = 15
B yes
(2/3)v = 8
3×(2/3)v = 3×8
2v = 24
2v/2 = 24/2
v = 12
C no
6z = 84
6z/6 = 84/6
z = 14
that is not z = 8
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