\(7x+5y=90\)
\(Th1:7x+5y=7.10+5.4\)
\(\Rightarrow x=10;y=4\)
\(Th2:7x+5y=7.5+5.11\)
\(\Rightarrow x=5;y=11\)
\(7x+6y=119\)
\(Th1:7x+6y=7.5+6.14\)
\(\Rightarrow x=5;y=14\)
\(Th2:7x+6y=7.11+6.7\)
\(\Rightarrow x=11;y=7\)
\(Th3:7x+6y=7.17+6.0\)
\(\Rightarrow x=17;y=0\)