Can someone help me with this 2 step eqaution

The answer is:  " 40 books " .
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Explanation:
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Let "x" equal the number of books that Jill started with.  Solve for "x" :
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         x – (1/2)x  + 16 = 36 ;

1x – (1/2)) = (1/2)x ; 

(1/2)x + 16 = 36 ; 

Subtract "16" from EACH SIDE of the equation:

(1/2)x + 16 – 16 = 36 – 16  ; 

(1/2)x = 20 ; 

Multiply each side of the equation by "2" ; 

2*(1/2)x = 20 * 2 ; 

to get:  x = 40 . 
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The answer is:  " 40 books " .
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