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5x + y = z + 7
5x = z - y + 7
x = (z - y + 7)/5
B)
3a - z = 8a + 2c
3a - 8a = 2c + z
5a = -2c - z
a = (-2c - z)/5
C)
(4 + k)/3 = m
4 + k = 3m
m = (4 + k)/3