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f(-1)=a
maka
3.-1+10=a
a=7
f(b)=-2
3.b+10=-2
3b=-12
b=-4
jadi
a+b=7+(-4)=3
-3=a-b=-2
-3+10=a
3b+10=-2
-3=a
3b=-2
b= -3/2
a+b = -3 + -3/2 = -9/2