Explicación paso a paso:
x-y=4
x-y-4=4-4
x-4-4= 0
x=3y
x-3y=3y-3y
x-3y=0
espero que te ayude
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Explicación paso a paso:
x-y=4
x-y-4=4-4
x-4-4= 0
x=3y
x-3y=3y-3y
x-3y=0
espero que te ayude