Answer
$P=137$ or $P=103$
Work Step by Step
$P_d=\mid P-120\mid$
Here, $P_d=17$, we substitute in the equation:
$17=\mid P-120\mid$
We have two possibilities:
$17=P-120$
$P=137$
or
$17=120-P$
$P=120-17$
$P=103$
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