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y- liczba dziesiątek
z-liczba jedności
x= 10y +z
{y-z=4
{10y +z -36= 10z +y
{z=4-y
{10y +4 -y -36 = 10(4-y) +y
9y -32 = 40 -10y +y
9y -32 = 40 - 9y
18y = 72
y=4
z=4-4=0
{y=4
{z=0
odp. x=40