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(1,-2) didilatasi pusat (0,0) faktor skala 2 = (2(1), 2(-2)) = (2,-4)
(x,y) dicerminkan thp x = a => (2a - x, y)
(2,-4) dicerminkan thp x = 3 => (2(3) - 2, -4) = (4, -4)