Give an explicit example of a system of two equations in three variables that is inconsistent.
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x+3y=3 ×2
2x+3y=6
x=3-3y
2(3-3y)+3y=6
6-6y+6y=6
6=6
2x+3y=6
x=3-3y
2(3-3y)+3y=6
6-6y+6y=6
6=6
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