I guess your question is:
( 2 x - 5 ) / 5 - ( x + 4 ) / 7 + ( 4 - x ) / 6 = ( 10 - x ) / 3
If so then:
Least common multiplier of 5, 7, 6, 3 =
Least common multiplier of 5 , 7 , 2 ∙ 3 , 3
LCD = 5 ∙ 7 ∙ 2 ∙ 3 = 210
( 2 x - 5 ) ∙ 210 / 5 - ( x + 4 ) ∙ 210 / 7 + ( 4 - x ) ∙ 210 / 6 = ( 10 - x ) ∙ 210 / 3
42 ∙ ( 2 x - 5 ) - 30 ∙ ( x + 4 ) + 35 ∙ ( 4 - x ) = 70 ∙ ( 10 - x )
84 x - 210 - 30 x - 120 + 140 - 35 x = 700 - 70 x
19 x - 190 = - 70 x + 700
Add 70 x to both sides
19 x - 190 + 70 x = - 70 x + 700 + 70 x
89 x - 190 = 700
Add 190 to both sides
89 x - 190 + 190 = 700 + 190
89 x = 890
Divide both sides by 89
x = 890 / 89
x = 10
2x-5/5 -x+4/7 +4-x/6 = 10-x/3
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