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a+b=3
-3a+b=11
------------- -
4a=-8
a=-2
a+b =3
-2+b=3
b=3+2
b=5
f-3=a(-3)+b=11
——————-------- -
a(-2)= -8
a= 4
f1= 4(1)+b=3
4+b=3
b=4-2
b = 1