Помогите решить каждую систему двумя способами( Методом Крамера и методом Гаусса)
1) [tex]\left \{ {{3x-8y=-2} \atop {2x+y=5}} \right.[/tex]
2) [tex]\left \{ {{2x+7y-z=-5} \atop {x-5y+2z=0}} \atop {3x+y-3z=-9}} \right.[/tex]
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