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OpenStudy (anonymous):
simplify n-4-9
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hartnn (hartnn):
n-4-9 = n- (4+9) so whats 4+9= ?
OpenStudy (anonymous):
Add 9 and 4, subtract from n.
hartnn (hartnn):
so did u get n-13 ?
OpenStudy (anonymous):
yea
hartnn (hartnn):
then its correct :)
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