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y-większa liczba
{x-25=y
{3x=5x
{x-25=y
{3x=5(x-25)
{x-25=y
{3x=5x-125
{x-25=y
{125=2x/2
{x-25=y
{62.5=x
{62.5-25=y
{y=37.5
{x=62.5