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-z - z = -3 - 2
-2z = -5
z = 5/2
b) 3a - 2 = -a + 18
3a + a = 18 + 2
4a = 20
a = 5
c) ½(4x + 2) = 3
2x + 1 = 3
2x = 2
x = 1
d) 2a - 1 = 3a - 5
2a - 3a = -5 + 1
-a = -4
a = 4
e) 2(3x - 1) = 2(2x + 3)
6x - 2 = 4x + 6
6x - 4x = 6 + 2
2x = 8
x = 4
g) 3q - 1 = q + 3
3q - q = 1 + 3
2q = 4
q = 2