Question 202857
1) x + y =71,,,,,y=71-x
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2) (2/3 )x -40 = 16-y = 16-(71-x) = -55 +x
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(-1/3) x = -15
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x=45,,,,,y=71-45=26
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check,,,(1)  45 +26 =71,,,ok
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(2) 2/3 (45)-40 =16-26,,,,,-10 =-10,,,,,ok