Simplifying fractions

Question

Hi, I need to know how this answer was obtained. So for (-e-1)/(1-e) ,

it says the answer is (1+e)/(e-1)

Answer 1

(-e - 1) / (1 - e)

-(-e - 1) / -1(1 - e)     multiply by 1 (as -1/-1)

(e + 1) / (-1 + e)        distribute

(1 + e) / (e - 1)          commutative property

 

 

Answer 2

(-e-1)/(1-e);  multipy both numerator & denominator by -1.

the answer is (1+e)/(e-1)