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2. jika |f(x)| > a ,maka f(x) >a atau f(x) <-a
karena disoal tandanya < maka pakai rumus yg pertama
|3 - 2x| < 1
-1 < 3 - 2x < 1
(-1 - 3) < -2x < (1- 3)
-4 < -2x < -2 ( dibagi (-2))
2 > x > 1 atau 1 < x < 2