A - 2x-y=20
2x+y-41
B- 2x-3y=16
5x+5y=2
C-3x+y=0
11+-y=42
D- x+3y=5
2x-y=4
E-3x+3y=21
2x-y=5
F-3x+5y=7
2x-3y=11
Respondam, por favor. Desde já agradeço.
a)?sinal
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