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f(1)=a.1+b------------ a+b=2
f(2)=a.2+b------------ 2a+b=1
-------------dikurang
-a =1
a =-1
a+b=2
-1+b=2
b=2+1
b=3
f(x)= -x + 3
f(x-1)=-1(x-1)+3
f(x-1)=-x+1+3
f(x-1)= -x+4