решить систему уравнений методом подстановки
1)
{x+y=3
{х^2+2y^2-xy+2x-3y=3

2)
{x+y=5
{x^3+y^3=35

3)
{ 3x=y+1
{7^y-2x+2=7^y-4x+1+6
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