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Sagot :
[tex] \left \{ {{x+y=34} \atop {x-y=18}} \right. \\+----\\\\2x=52\ \ \ \ \ |:2\\x=26\\\\26+y=34\\y=34-26\\y=8\\\\ \left \{ {{y=8} \atop {x=26}} \right. [/tex]
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