Question 181563
3{[7(x-2)+4]-[2(2x-5)+6]}
----------------
The parentheses come in pairs; each open parentheses must have a close
parentheses associated with it,  Brackets come in pairs and parentheses
come in pairs.  They are equal in their meaning.

-----------------------------------------------------
3{[7(x-2)+4]-[2(2x-5)+6]}

Rule: work from the inside out.

= 3{[7x-14+4]-[4x-10+6]}

= 3{[7x-10] - [4x-4]}

= 21x - 30 -4x + 4

= 17x - 26
==============
Cheers,
Stan H.