Maybe try:
x+12=600
Then subtract 12 from both side so that it’s x=588
I think that’s the answer, although probably not bc my minds still stuck in Algebra from helping someone else 
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Maybe try:
x+12=600
Then subtract 12 from both side so that it’s x=588
I think that’s the answer, although probably not bc my minds still stuck in Algebra from helping someone else