Alguem por favor pode resolver esta equação x- y =6 x+y = -7

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adrielcavalcant
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[tex]x - y = 6\\\\ 
x - y - 6 = 0
\\\\ x + y = -7
\\\\ x + y + 7 = 0
\\\\ Some ...\\\\
 (x - y - 6 )+ (x+ y + 7) = 0
\\\\ 2x = -13\\\\ \boxed{x = -\frac{13}{2} }\\\\ x + y = -7 \toy = -7 -x\\\\ y = -7 - \frac{13}{2}\\\\ \boxed{y = -\frac{1}{2} } [/tex]
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