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f(x)=4
a+b=4
f(3)=6
3a+b=6
a+b=4
3a+b=6
______ _
-2a=-2
a=1
3a+b=6
3(1)+b=6
3+b=6
b=6-3
b=3
jadi,a+b
=1+3
=4
soalnya udah bener ta