2 Equations But 3 Unknowns?

Algebra Level 1

\[ \begin{array} { c c c c c c c } 3a &+& 7b &+ &c &= & 315 \\ 4a &+& 10b &+& c &= & 420 \\ a &+& b &+& c &= & ? \end{array} \]

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