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f(3) = 2(3) + 3 = 9
f(a) = 13
2a + 3 = 13
2a = 10
a = 5
⇔ = 6 + 3
= 9
b. f(x) = 2x + 3 ⇔ f(a) = 2a + 3
⇔ 13 = 2a + 3
2a = 13 - 3
a = 10 /2
a = 5