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f(-5)=15
f(5)=-5
-5a+b=15
5a+b=-5 (dikurang)
-10a=20
a=-2
-5a+b=15
-5.-2+b=15
10+b=15
b=5
f(1)=-2.1+5
=-2+5
=3
f(1)=a.1+b
=a+b/1+1
=2