5x-7y+2zfrom-5x-7y-2z
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-5x-7y-2z
5x-7y+2z
________=0
then we change sybool +convert to -nd -to+
-10x-4z=o
5x-7y+2z
________=0
then we change sybool +convert to -nd -to+
-10x-4z=o
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