PEMDAS
order of operations
parenthasees
exonents
mulitplication or division whichever comes first
addition or subtracton whichever comes first
parenthasees inner first
innermost is 2.8 times 5
2.8 times 5=14
then we have
13+26-[(14)/7]
division withint the parenthasees
14/7=2
now we have
13+26-[2]
addition
13+26=39
now we have
39-2
37
