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3x-2=x
3x=x+2
x=(x+2)/3
maka rumus f(x) adalah
((x+2)/3)^2+2
=(x^2+4x+4)/9+2
b)f(5x-3)=(4x-5)/(3x+1)
5x-3=x
5x=x+3
x=(x+3)/5
maka rumus f(x) adalah
(4((x+3)/5)-5)/(3((x+3)/5)+1)
=((4x+12)/5-5)/((3x+9)/5+1)