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{x-3y=0
{2x-y=10
{x=3y
{2x-y=10
{x=3y
{2×3y-y=10
{x=3y
{6y-y=10
{x=3y
{5y=10/5 (/obie strony dziele przez 5)
{x=3y
{y=2
{x=3×2
{y=2
{x=6
{y=2
metodą graficzną to dodam załącznik