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Anonymous
X=1.42857142857143
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2x +n5y=12
x - 3y = -3: multiply by -2 giving -2x + 6y = 6, but -2x + 6y = 12 so we have a problem! Misprint?
2x+10=12 2x=2 x=1
2x-12
2x + 3y = 1 y = 1/3 - 2x/3