math
posted by
cody
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if 25 is added to three times a number the result is 70.find the number?

math 
Ms. Sue
25 + 3x = 70
How do you think you'll solve this equation?
Cody, I've asked you similar questions before, and you haven't responded. Why?

math 
marissa
you subtract 25 from each side of the equation to get 3x=45. then you divide each side by 3 to get x=15. your just undoing the math