( X - 7 ) : 6 = ( X + 1 ) : 2 - 3
( X - 7 ) : 6 = ( X + 2 - 6 ) : 2
2 * ( X - 7 ) = 3 * ( X - 4 )
2X - 14 = 3X - 12
3X - 2X = - 14 + 12
X = - 2
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1/2 - ( 3X ) : 4 = 2 * ( 3 - X ) : 5
2/4 - ( 3X ) : 4 = ( 6 - 2X ) : 5
5 * 2 - 5 * 3X = 4 * ( 6 - 2X )
10 - 15X = 24 - 8X
15X - 8X = 10 - 24
7X = - 14
X = - 2