Answer:
x=-4
Step-by-step explanation:
First, we can distribute the 2 on the right side, giving us
5x-40=2*5x + 2*(-10)
Simplifying, we get
5x-40=10x-20
Adding 40 to both sides and subtracting 5x from both sides leaves us with
5x+20=0
Then, subtracting 20 from both sides,
5x=-20
Dividing by 5,
x=-4
