solve each equation for the variable

b = -100
In order to solve, just flip the equation:
[tex]\frac{b}{-12.5} = 8[/tex] flips to 8 × -12.5 = b
Which should equal -100
Doulble check using substitution:
[tex]\frac{(-100)}{-12.5} = 8[/tex]
It works! Therefore the variable b = -100!