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y - siostry
x-1 = y
x = 2(y-1)
x = y+1
x = 2y-2
x = y+1
y+1 = 2y-2
x = y+1
1+2 = 2y-y
x = y+1
y = 3
x = 3+1
y = 3
x = 4
y = 3
bracia - 4
siostry - 3
razem: 4+3 = 7