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A ( a , b ) ⇒ = A' ( x + k ( a - x ) , y + k ( b - y ) )
R ( -2 , 1 ) ⇒ = A' ( 4 + -0,5 ( -2 - 4 ) , -3 + -0,5 ( 1 - -3 ) )
A' ( 3,5 × -6 , -3,5 × 4 )
A' ( -21 , -14 )