Помогите решить уравнение (712+1130х):714=13

( ( 7/12 ) + ( 11/30 )X ) : 7 ( 1/4 ) = 1/3
( 7/12 ) + ( 11/30 ) X = ( 1/3 ) * ( 29/4 )
( 7/12 ) + ( 11/30 ) X = 29/12
( 11/30 ) X = ( 29/12 ) - ( 7/12 )
( 11/30 ) X = ( 22/12 )
X = ( 11/6 ) : ( 11/30 )
X = 30/6
X = 5