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x₁ + 3 / 2 = -3 y₁-7 / 2 = 13
x₁ + 3 = -6 y₁ - 7 =26
x₁= - 9 y₁= 33
A= (-9;33) B=(3,-7)
|AB|= √(3+9)² + (-7-33)² = √ 12² + (-40)² = √ 144 = 1600 = √ 1744
(x + 3)² + (y-13)² = √1744 / 2
punkt B jest dobrze policzony co do równania nie jestempewna ;)