Resolva os seguintes sistemas: a) 2x + y= 5
2x + 3y= 2
b) x +y=4
2x - 3y=3
c) x + y = 25
2x+ 3y =55
2x + 3y= 2
b) x +y=4
2x - 3y=3
c) x + y = 25
2x+ 3y =55
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