Me ajudem á responder alguns sistemas!?

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.

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