=>xy=-12
=>\(\left(x,y\right)\in\left\{\left(1;-12\right);\left(-12;1\right);\left(-1;12\right);\left(12;-1\right);\left(2;-6\right);\left(-6;2\right);\left(-2;6\right);\left(6;-2\right);\left(3;-4\right);\left(-4;3\right);\left(-3;4\right);\left(4;-3\right)\right\}\)