х=7+у
(7+у)^2 - (7+у)у - у^2 =19
49+14у+у^2-7у-у^2-у^2-19=0
-у^2+7у+30=0
Д=49+120=169
у1=(7+13)/2=10
у2=(7-13)/2=-3
х1=17
х2=4
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х=7+у
(7+у)^2 - (7+у)у - у^2 =19
х=7+у
49+14у+у^2-7у-у^2-у^2-19=0
х=7+у
-у^2+7у+30=0
Д=49+120=169
у1=(7+13)/2=10
у2=(7-13)/2=-3
х1=17
х2=4