\left\{ \begin{array} { l } { 2 p + 5 q - v = 25 } \\ { 3 p - 2 q + 5 r = 4 } \end{array} \right.
Solve for p, q, v, r
p=\frac{70+2v-25r}{19}
q=\frac{10r+3v+67}{19}
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