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6p + q = 13 - q = 4 - 9
-3p = -9 q = -5
p = -9 : -3
p = 3
b. f(12) = 3(12) - 5 = 36 - 5 = 31
c. f(c) = 3c - 5 = 19
3c = 19 + 5
c = 24 : 3
c = 8