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a-2.(-2-1/2a)=8
a+4+a=8
2a=8-4
a=4/2
a=2
b=-2-1/2.a
b=-2-1/2.2
b=-3
verifico:
1/2a+b=-2
1/2.2-3=-2
1-3=-2
-2=-2
a-2.b=8
2-2.(-3)=8
2-(-6)=8
8=8