Question

pls file:///C:/Users/User/Music/bfd002a74c90620150f3034193fb42d9.jpg

Answer 1

$6a+\frac{7b-30a^2}{5a}=\\=\frac{7b-30a^2}{5a}+\frac{6a\cdot \:5a}{5a}=\\=\frac{7b-30a^2+6a\cdot \:5a}{5a}=\\=\frac{7b}{5a} =\frac{7\cdot \left(-15\right)}{5\cdot 7}=\\=-\frac{15}{5}=-3$