[tex]\displaystyle \left \{ {{a=6} \atop {2a-b=22}} \right.\\ \\2*6-b=22\\b=-10\\(a,b)=(6,-10)[/tex]
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[tex]\displaystyle \left \{ {{a=6} \atop {2a-b=22}} \right.\\ \\2*6-b=22\\b=-10\\(a,b)=(6,-10)[/tex]