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2 = a+b
1 = 2a+b
-
1=-a
a = -1
b = 3
b.
-6 = 0 + b
b = -6
-5 =3a -6
3a = -5 +6
3a = 1
a = 1/3
c.
4 = 4a+b
3 = 2a+b
-
1 = 2a
a = 1/2
b=2