Answer:
see explanation
Step-by-step explanation:
Note that a fraction multiplied by it's inverse = 1, that is
[tex]\frac{4}{5}[/tex] × [tex]\frac{5}{4}[/tex] = 1
Thus multiplying both sides of the equation by - [tex]\frac{5}{4}[/tex] will solve the equation in one step.
- [tex]\frac{4}{5}[/tex] ( - [tex]\frac{5}{4}[/tex] ) x = 80 ( - [tex]\frac{5}{4}[/tex] ), that is
x = - 100
