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Mathematics 17 Online
OpenStudy (anonymous):

4(3n+5-12)

OpenStudy (saifoo.khan):

4(3n+5-12) 4(3n-7) 12n -28

OpenStudy (anonymous):

=4(3n)+(4)(5)+(4)(-12) = 12n + 20 - 48 = 12n - 28

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