Question 494504
Hello, 
It's a general maths question.
For example if I have:  x=2(b-a)/(b-a)
and I allowed to cross out the 2 brackets (b-a) and simply state that x=2
or are there some steps in order to conclude to that answer?
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You can cancel the b-a terms, but you have the restriction that 
b-a cannot equal zero, --> b not equal to a.
The denominator cannot be zero.