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f (2a - 1) = 23
f (2a - 1) = 2 - 3(2a - 1)
23 = 2 - 6a + 3
23 = 5 - 6a
23 - 5 = -6a
18 = -6a
a = 18/-6
a = -3
=2-6a+3=23
=-6a+5=23
-6a=23-5
-6a=18
a=-3