Имеет ли решение система уравнений:
1) [tex] \left \{ {{x-y=4} \atop {3x-3y=6}} \right. [/tex]
2) [tex] \left \{ {{x-1,5=-4} \atop {3y-2x=8}} \right. [/tex]
3) [tex] \left \{ {{9x+9y=18} \atop {x+y=2}} \right. [/tex]
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