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x' = 2a - x
y' = y
x' = 2(-1) - (-3)
y' = 4
x' = -2 + 3
y' = 4
x' = 1
y' = 4
koordinat = (1,4)
translasi T(a, b)
x' = x + a
y' = y + b
x' = 1 + 3
y' = 4 + 7
x' = 4
y' = 11
= (4, 11)