Posted by brooke on Sunday, March 27, 2011 at 2:46pm.
Multiply the # outside the parenthesis by each item inside the parenthesis to remove the parentesis and then combine the like terms (r's & s's).
7r + 21s - 4r + 18S
then combine like terms
7r +21s - 4r +18s
7r-4r =21s+18s
3r+39
Does this sound correct.
Yes , but 39s
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