4 is the correct answer.
First you do is add by 20 from both sides of an equation.
5x-20+20=0+20
Then, you simplify.
5x=20
You divide by 5 from both sides.
5x/5=20/5
Finally, then you simplify.
20/5=4
X=4 and 4, which is our correct answer.
I hope this helps you!
Have a nice day! :)
-Charlie
5x - 20 = 0
+ 20 + 20 Add 20 on both sides to cancel out -20
5x = 20
/5 /5 Divide by 5 to get x variable alone
x = 4 The zero of 5x - 20 = 0 is 4 or Choice B
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Prove.
5x - 20 = 0
5(4) - 20 = 0
20 - 20 = 0
0 = 0
True.
