It's a simple problem
take minus( - ) common from denominator or numerator
(b - a) / -(b - a)
= -1
How I could simplify b-a/a-b? The result is b-a/a-b= -1. I don't know how we do this !
It's a simple problem
take minus( - ) common from denominator or numerator
(b - a) / -(b - a)
= -1
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