Respuesta :

Molly=4x+10
Ron=20-5x

Molly + Ron=(4x+10)+(20-5x)=(10+20)+(4x-5x)=30-x.

Answer: they have all togehter  30-x  

and for the answer for the second question 

4x+10-(20-5x)
4x+10-20+5x
9x-10