[tex]1)x_{1}+x_{2}=3+2;\\ 2)x_{1}+x_{2}=11-14;\\3)x_{1}+x_{2}=34-30;\\4)x_{1}+x_{2}=5-11;[/tex]
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[tex]1)x_{1}+x_{2}=3+2;\\ 2)x_{1}+x_{2}=11-14;\\3)x_{1}+x_{2}=34-30;\\4)x_{1}+x_{2}=5-11;[/tex]