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maka
f(-1)=5
-a+b=5
f(-2/3)=2
-2/3a+b=2
-a+b=5
-2/3a+b=2
(-1+2/3)a=3
(-1/3)a=3
a=3 x (-3)
a=-9
-a+b=5
-(-9)+b=5
b=5-9
b=-4
jadi sisanya -9x-4