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=7a+b=-8
f(3)=a.3+b=0
=3a+b=0
7a+b=-8
3a+b=0 -
4a =-8
a =-8:4
a =-2
3a+b=0
3.-2+b=0
b=6
f(5)=-2.5+6
=-10+6
=-4