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x^2 +5x + 6 = 0
delta = 25 - 24 = 1
sqrt(delta) = 1
x1 = (-5 - 1)/2 = -3
x2 = (-5 + 1)/2 = -2
ad 2
x - y = 26
x + y = 220
2x = 246
x = 123
y = 97