Solve for p
p=\frac{19-x}{7}
Solve for x
x=19-7p
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7p=19-x
Subtract x from both sides.
\frac{7p}{7}=\frac{19-x}{7}
Divide both sides by 7.
p=\frac{19-x}{7}
Dividing by 7 undoes the multiplication by 7.
x=19-7p
Subtract 7p from both sides.
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