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4-73.

Solve the following absolute value inequalities.

1. $| x - 4 | < 9$

See problem 4-66 for additional examples.

$−5

1. $| \frac { 1 } { 2 } x - 45 | \geq 80$

See part (a).

$x\ge250\ \text{or}\ x\le−70$

1. $| 2 x - 5 | \leq 2$

See part (a).