Resolva os sistemas pelo método da substituição a) { x- y = 5
a) { x + y = 7

b) 2x + y = 0
b) 2x - y = 4

c) 4x - y = 6
c) 4y = 8

d) x + y = 0
d) 2x + y = 14

e) 3x + 2y = 12
e) x - 3y = -7
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