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maka (y-3)/2=x
f(y)=5(y-3)/2 + 3
f(-1)= 5(-1-3)/2 + 3
= -10/3
coba hitung ulang y.. semoga caranya bisa membantu
utk x = - 2 maka
f(-1) = 5(-2) - 8
= - 18