Idon't understand this solve for x 2/(9x) = 4/7 18/7 i don't know - 18/7 7/18 - 7/18

The correct answer is:  [C]:  " " .
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Explanation:
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Given:
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  2 / (9x) = 4 / 7 ;  solve for "x" ;
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Cross-multiply:

        →   (9x)*4  = 2 * 7 ; 

        →   36x = 14 ; 

Divide each side of the equation by "36" ; 
 to isolate "x" on one side of the equation; & to solve for "x" ; 

        →   36x / 36 = 14 / 36 ; 

                   x = 14/ 36 ; 

                  → x = 14/36 = (14÷2) / (36÷2) = 7/18 ; 
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The answer is:  " " ;

                       →  which is:  Answer choice:  [C]:  " " .
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