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b = 4
2a+b = 2(1)+4 = 6
f(1)=5
a+b=5
f(-1)=3
-a+b=3
a+b=5
-a+b=3
______ -
2a=2
a=2/2
a=1
-a+b=3
-1+b=3
b=3+1
b=4
2a+b
=2(1)+4
=2+4
=6