Replace x with each value then solve:
f(3) = 2(3) +1 = 7
f(0) = 2(0) +1 = 1
f(2) = 2(2) +1 = 5
f(1) = 2(1) + 1 = 3
Now you have:
7 -1 / 5 -3 = 6/2 = 3
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