Respuesta :

-5c + 9c = -20
Combine like terms
4c = -20
Divide 4 from both sides
c = -5
[tex]-5c+9c=-20[/tex] 

[tex]4c=-20[/tex] 

[tex]c= -\dfrac{20}{4} [/tex] 

[tex]c=5[/tex]