8th Math
posted by Cassidy on .
5x10 = 2(x+4)

5x  10 = 2  (x + 4)
4x = 12  4
4x = 8
x = 2 
Thx Ms.Sue! But why the +4 became 4? I confused with this part

There's a minus sign in front of the quantity in parentheses
2  (x + 4)
A + and a  is always a minus. 
what if there's a sign of positive in front of the quantity in parenthese, such like 2+(x+4)....which mean the +4 will be staying the same as +4?

Yes.