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x' = 2a - x ==> 2a = x' + x
y' = 2b - y==> 2b = y' + y
titik (x,y) = (2, -3) ---> (x',y')= 5,2
2a = x' + x --> 2a = 2+5 --> a = 7/2
2b = y' + y --> 2b = 2-3 --> b = -1/2
P( 7/2 , - 1/2)