How can you make the following equation true by drawing only one straight line:

**5+5+5=550**

Can you figure it out?

Just join the top vertice of the second plus sign (I wonder if I may call it so?)to the left vertice and + becomes 4. Then you have 545 + 5 = 550

(An alternative answer would be to draw a line through the equal sign. But then it is not an equation)