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f(a)=4a-3=17
4a=20
a=5
2.f(x)=5x-7
f(2a+1)=5(2a+1)-7
10a+5-7
10a-2
10a=2
a=1/5
f(a)= 4a-3= 17
a= 5
2. 10a = 2
a = 1/5