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A ( a, b ) ⇒ T ( a' - a , b' - b ) = A' ( a' , b' )
P ( -12 , 30 ) ⇒ T ( -12 - 1 , 30 - (-8) ) = P' ( 1 , -8 )
T ( -13 , 38 )
30--8=38
jwabanya (-13,38)