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25-10-2016
Mathematics

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solve 7m+2n=21 and 10m+4n=-10 with substitution

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25-10-2016

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10m+4n= -10

5m+2n= -5

-5m-2n= 5

7m+2n-5m-2n= 21+5

5m=26 m= 26/5

5.26/5+2n= -5

26+2n= -5

2n= -31

n= -31/2

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