Question

2p+5r=q for p

Answer 1

look at this example:
\[6x + 5y = z \rightarrow 6x + 5y - 5y = z - 5y \]
then
\[\frac{6x}{6} = \frac{z-5y}{6} \rightarrow x =\frac{z-5y}{6}\]

STUDY it