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Verified answer
(9,-2) refleksi thd (a,b) ---> (-2,4)x' = 2a - x
-2 = 2a - 9
2a = -2 + 9
a = 7/2
y' = 2b - y
2b = y' + y
b = (4 + (-2))/2
b = 1
2a - b = 2 . 7/2 - 1 = 7 - 1 = 6