What comes to mind when you think about doing the opposite operation in math?

roperj

tjone575

michael.curry

lisashoppelle

lisashoppelle

karen_souza-newcomb

lisashoppelle

fadams

mbeam

colmdhogan

adina.opris

lowe.j

edit.marki

deborah_robinson

reilly_lauren

mcgrath_meghan

brandon.houdek

sgunn

carrie.white