2 Equations But 3 Unknowns?

Algebra Level 1

3a+7b+c=3154a+10b+c=420a+b+c=? \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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