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Here's a kind of problem that pops up a lot in Algebra:

127 - 2 ( 3 + 4 )^2

 

PEMDAS:  Do P first... Then, do E...  Then, do M...  Then, do S

 

127 - 2 ( 3 + 4 )^2 = 127 - 2 ( 7 )^2   This is really  127 - 2 x 7^2 = 127 - 2 x 49 = 127 - 98 = 29