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p = 3 - 4 = - 1
b) q - 2 = 6
q = 8
c) 2a + 3 = 5
2a = 5 - 3
a = 1
d) 9 - 3r = 6
9 - 6 = 3r
3r = 3
r = 1
e) 18 = 10 - 2m
2m = 10 - 18
m = - 4