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2) |a| = a ----> |6| = 6
3) x < 0 --> |2x| = - 2x
4) f(-3) = |-3| = 3
5) f(1) = | 4(1) -7| = |4-7| = |-3 | = 3
6) jarak = |-4 - 6| = |-10| = 10