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x+y=7
x+3y=7
x=7-3y
2(7-3y)-y=0
14-6y-y=0
14-7y=0
-7y=0-14
-7y=-14
y=-14:-7
y=2
x+3.(2)=7
x+6=7
x=7-6
x=1
Esa es la A, ahora te hago la B