$$I3+5p=7$$
$p=\frac{7-I_{3}}{5}$
$$5p=7-I_{3}$$
$$\frac{5p}{5}=\frac{7-I_{3}}{5}$$
$$p=\frac{7-I_{3}}{5}$$
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$I_{3}=7-5p$
$$I_{3}=7-5p$$