Question 308567
(2x+2)(5x-5)=0

either of the terms in the bracket can be 0 for the equation to be justified.

either (2x+2)=0
Or
(5x-5)=0

if 2x+2 =0
2x=-2

x=-1
..
..
If 5x-5 =0
5x= 5
x=1

if x=1 OR x=-1 then the left side value is 0