So AB? = 12.6? +3.2? = 169

BC? =9.6? +7.2? = 144

AC？ =3? +4? =25

AC？ +BC？ =AB？

right triangle

Let M(a, 0)

Then (a-5)? +5? +(a+7.6)？ +8.2? =2[(a-2)？ + 1? ]

Answer? - 10a+25+25+a？ + 15.2a+57.76+67.24=2a？ -8a+ 10

5.2a+ 175=-8a+ 10

13.2a=- 165

a=- 12.5

So m (-12.5,0)