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p = 3 + 2 = 5 r = -1 + 1 = 0
q - 3 = 5 s - 0 = 2
q = 5 + 3 = 8 s = 2
b) 4 - p = 5 -7 -r = 3
p = 4 - 5 = -1 -r = 3 + 7
r = 10
-6 - q = -3 14 - s = 0
-q = -3 + 6 -s = -14
q = -3 s = 14