Помогите даю 50 баллов. Срочно!!!!!!
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                  \left \{ {{k+y-5k+5y=15} \atop {2k-y-6k-4y=-150}} \right. 
 \left \{ {{4k-6y=-15} \atop {4k+5y=150}} \right. 
 \left \{ {{4k=-15+6y} \atop {-15+6y+5y=150}} \right. 
 \left \{ {{4k=-15+6y} \atop {11y=165}} \right. 
 \left \{ {{y=15} \atop {k=75/4}} \right. 
   

 

                    

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