Resolva os sistemas formados pelas equações:
A) x-7y = 15
4x+7y = 10

B) 3x+2y = 13
x-2y = 7

C) 2x+y = 4
3x-y = 1

D) 2x+y = 5
x-y = 1

E) x+2y = 4
3x-2y = 8

F) 5x+y = 5
x-y = 1

G) x+y = 4
2x-y = 11​
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