=>x(y+1)+y+1=11
=>(x+1)(y+1)=11
=>\(\left(x+1;y+1\right)\in\left\{\left(1;11\right);\left(11;1\right);\left(-1;-11\right);\left(-11;-1\right)\right\}\)
=>\(\left(x,y\right)\in\left\{\left(0;10\right);\left(10;0\right);\left(-2;-12\right);\left(-12;-2\right)\right\}\)
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