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3a+b= 9 -
-6a =-24
a = 4
3a+b=9
3.4+b=9
12+b=9
b=-3
f(-2)=4(-2)-3
=-8-3
=-11
f(2)=4(2)-3
=8-3
=5
f(-2)+f(2) = -11+5 = -6