$$\frac { - p } { 7 } + \frac { 1 } { 14 } = \frac { 10 } { 28 }$$
$p=-2$
$$4\left(-p\right)+2=10$$
$$4\left(-p\right)=10-2$$
$$4\left(-p\right)=8$$
$$-p=\frac{8}{4}$$
$$-p=2$$
$$p=-2$$
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