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Factorise 12pr + 2st - 3pt -8rs

User Sherin
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if you have 12 pr's, and you take 3 away... you're left with 9 pr's....
12pr + 2st - 3pr -8rs
9pr +2st - 8rs
Now, there are no two of the same thing.. so you can't factorize anymore.
User Zahra Mirzaei
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