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f(2)= 2a+b=3 .....(1)
f(-3)= -3a+b=13 .....(2)
(1) dan (2) eliminasi (sebenernya bisa pake elimimasi ataupun subtitusi)
2a+b=3
-3a+b=13
________-
5a= -10 subtitusi a (1 atau 2)
a= -2 -4+b= 3
b= 7
maka -a+b = -(-2)+7
= 2+7
= 9