f(a) = 4a-1 = -9
4a = -8
a = -2
f(2) = 8 - 1 = 7
a - b = -2 - 7 = - 9
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f(a) = 4a-1 = -9
4a = -8
a = -2
f(2) = 8 - 1 = 7
a - b = -2 - 7 = - 9