Question

7/B+5=10/5 and you have to cross multiply

Answer 1

`(7)/(b+5)=(10)/(5)\\\\10(b+5)=\frac{}{}7\cdot5\\\\10b+50=35\\\\10b=35-50\\\\10b=-15\ \ \ \ |:10\\\\b=-(15)/(10)=-(3)/(2)=-1(1)/(2)`