[tex]\frac{-5}{6}(8+5b)=75+\frac{5}{3}b[/tex]
Multiply through the equation by 6
[tex]-5(8+5b)\text{ = 450+10b}[/tex]
open the parenthesis
-40 - 25b = 450 + 10b
collect like term
10b + 25b = -40 -450
35b = -490
Divide both-side of the equation by 35
b = -14
