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what is the answer to 2s+3t+s+7t

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2 Answers

Hi, Annabelle! Just combine the "like terms" -- in this case, combine the every term with an "s" (so...2s + s, which would give you 3s), then combine the terms with a "t" (so you would add the 3t and the 7t, giving you 10t).  Your answer would be 3s + 10t.
 
Hope this helps!
 
p.s.  Here's one for you to try yourself:  What is the answer to 10a + 18b + a + 20b?