SOLUTION: right that the answer to 21=x-13 is 8 my girlfriend says its 34

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Question 548162: right that the answer to 21=x-13 is 8
my girlfriend says its 34
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
21=x-13
add 13 t0 both sides
21+13=x-13+13
34=x+0
x=34