¿como se resuelve este problema de matematicas?

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<img src="https://tex.z-dn.net/?f=0%2C84%3D%20%5Cfrac%7BPR%7D%7BSR%7D%20~~--%5C%20%5Ctextgreater%20%5C%20Se~sabe~que~%5BPR%3DPQ%2BQR%5D~y~%5BSR%3D217%2C5%5D%20%5C%5C%20%20%5C%5C%200%2C84%3D%20%5Cfrac%7BPQ%2BQR%7D%7B217%2C5%7D%20%5C%5C%20%20%5C%5C%200%2C84%28217%2C5%29%3DPQ%2BQR~~--%5C%20%5Ctextgreater%20%5C%20se~sabe~tambien~que~%5BQR%3D125%5D%20%5C%5C%20%20%5C%5C%20182%2C7%3DPQ%2B125~~--%5C%20%5Ctextgreater%20%5C%20despejado~%27%27PQ%27%27%2C%20tenemos%20%5C%5C%20%20%5C%5C%20PQ%3D182%2C7-125%20%5C%5C%20%20%5C%5C%20%5Cboxed%7B%5Cboxed%7BPQ%3D57%2C7m%7D%20%7D%20%5C%5C%20%20%5C%5C%20%20" />

<img src="https://tex.z-dn.net/?f=%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%20%5C%5C~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~%20Espero~te~sirva~saludos%21%21" />.