x+y=k\(\Rightarrow\)y=k-x
x-a/m=y-b/n
\(\Rightarrow\)x-a/m=k-x-b/n
\(\Rightarrow\)2x=a/m+k-b/n
\(\Rightarrow\)x=(a/m+k-b/n)/2
\(\Rightarrow\)y=k-x=k-a/m+b/n)/2
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x+y=k suy ra y=k-y
x-a/m=y-b
x-a/m=k-x-b/n
2x=a/m+k-b/n
x=(a/m+k-b/n
x=k-x=k-a/m+b/n)/2
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