To find the interval for the first piece, find where the inside of the absolute value is non-negative.

In the piece where is non-negative, remove the absolute value.

To find the interval for the second piece, find where the inside of the absolute value is negative.

In the piece where is negative, remove the absolute value and multiply by .

Write as a piecewise.

Find the intersection of and .

Multiply each term in by

Multiply each term in by . When multiplying or dividing both sides of an inequality by a negative value, flip the direction of the inequality sign.

Multiply .

Multiply by .

Multiply by .

Multiply by .

Find the intersection of and .

Find the union of the solutions.

Convert the inequality to interval notation.

Convert to Interval Notation |x|<=12