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f(7)=7-2
f(7)=5
f(20)=20-2
f(20)=18
f(2)=2-2
f(2)=0
b)
f(x)=11
11=x-2
11+2=x
13=x
f(x)=3
3=x-2
3+2=x
5=x
f(x)=100
100=x-2
100+2=x
102=x