Упростите(5 m+5):(3-3m) -( 4m+7):(5m+7)

[latex] \frac{5m+5}{3-3m}- \frac{4m+7}{5m+7}= \frac{(5m+5)(5m+7)-3(1-m)(4m+7)}{3(1-m)(5m+7)}=\\ \frac{25m^2+35m+25m+35-3(4m+7-4m^2-7m)}{3(1-m)(5m+7)}= \frac{25m^2+60m+35-12m-21+12m^2+21m}{3(1-m)(5m+7)}[/latex]=[latex] \frac{37m^2+69m+14}{3(1-m)(5m+7)} [/latex]