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f(2)=a
f(b)=-5
mencari a :
f(2)=4-3.2
f(2)=4-6
f(2)=-2
jadi a = -2
mencari b :
4-3b=-5
-3b=-5-4
-3b=-9
jadi b = 3
nilai dari 2b-5a=...
a dan b dimasukkan kedalam rumus
2b-5a=2(3)-5(-2)
=6+10
=16
jadi 2b-5a=16
f(b)=-5=4-3b;3b=9;b=3
2b-5a=2.3-5.-2=6+10=16