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Jeśli a²+b²=0 to a=b i b=0
Czyli w naszym równaniu:
x-y = 0
x+y-1 = 0
x=y
x+x-1 = 0
2x = 1
x = 1/2
y = x = 1/2
Czyli jedyne rozwiązanie to x = y= 1/2