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Algebra Difficulty 2.0 Junior Prove it Canada

If $M(7, 7)$ is the midpoint of the line segment which joins $R(1, 4)$ and $S(a, 10)$ , what is the value of $a$ ?

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.