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{ x=y
{ 5x-y=4
x=y
5y-y=4
x=y
4y=4
x=y
y=1
x=1
y=1
{5x-y=4
{x=y
{5x-x=4
{y=x
{4x=4 /:4
{y=x
{x=1
{y=1
{x=1
5x * 4y
20 xy