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y- liczba wszystkich sióstr
3(y-1)=x
x-1=y
3y-3=x
x-1=y
3y-3=y+1
2y=4
y=2
x=3
y liczba sióstr
x=y+1
x=3(y-1)
y=x-1
x=3(y-1)
y=x-1
x=3y-3
y=3y-3-1
x=3y-3
2y=4
x=3y-3
y=2
x=3y-3
y=2
x=3