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x=12-y-z
x=12+2yz
x=14yz
2x-y+z=7
2x=7+y-z
2x=7-1yz
2x=6yz
x=6yz-2
x=4yz
x+2y-z=6
x=6-2y+z
x=6-1yz
x=5yz
espero no altar equivocado