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f(a) = 2x-3 = 27
2(a) - 3 = 27
2a-3 = 27
2a = 27 + 3
2a = 30
a = 15
f(a) = 27
2a - 3 = 27
2a= 27 +3
2a = 30
a = 30/2
a = 15