7. 2х - у 13. 2х - 2y = 20.
8. 3 - 5 - 19 0, 7х + 3y+ 1 = 0
9. 2-3y+ 8 = 0; x y +7 0.
10. x+y =5xy. 3x+2y=13xy x =0 ,y=0
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