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y - 4 ( 7 - x ) = -6
x-3y+6=5
y-28+4x=-6
x-3y=-1
4x+y=22
multiplicamos la 2ª por 3
x-3y=-1
12x+3y=66
sumamos las 2
13x=65
x=65/13=5
x-3y=-1
x+1=3y
y=6/3=2
x=5 y=2