We have to simplify : 3a - [(4 - 3a)/5] - [(a - 4)/6]

3a - [(4 - 3a)/5] - [(a - 4)/6]

Open the brackets

=> 3a - [4 /5 - 3a/5] - [a/6 - 4/6]

=> 3a - 4/5 + 3a/5 - a/6 + 4/6

add terms with a and the numeric terms

=> 3a + 3a/5 - a/6 - 4/5 + 4/6

=> 103a/30 - 2/15

**Therefore 3a - [(4 - 3a)/5] - [(a - 4)/6] = 103*a/30 - 2/15**

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