Question 1081951
{{{system(m/b=9/7,(m-10)/(b-10)=7/5)}}}



{{{5m-50=7b-70}}}
{{{5m-7b=50-70}}}
{{{5m-7b=-20}}}
{{{7b-5m=20}}}
-
{{{7b-5(9b/7)=20}}}
{{{49b-45b=140}}}
{{{4b=140}}}
{{{4b=2*7*2*5}}}
{{{highlight(b=35)}}}