{6(x-3)=7y-1.
{2(y+6)=3x+2.
{6 (х-3) =7у-1
{х=10
6(10-3) = 7у-1
у=43/7
(х, у) = (10, 43/7)
{6(10-3) =7•43/7 -1
{2(10+6) =3•10+2
{42=42
{32=32
