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I don't want to spoil the fun, so here's a hintpic.twitter.com/PqYzyOIiRk
You can see that the first equality is true by proving the following propertypic.twitter.com/rFdH6N9mlr
I like that, what is it called? I mean does it has a name It make sense but I want to see how it could be proved. If you offer some name relates to it I will be happy! Thankyou!!
it's just a u-sub .. let u = a + b -x and then since u is a dummy variable you can just call it x
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