X-(9x-10)+11=12x+3(-2x+ 1/3)

X - (9x - 10) + 11 = 12x + 3(-2x +  ) equals x =  .

First, simplify brackets. / Your problem should look like: x - 9x + 10 + 11 = 12x + 3(-2x +  ). 
Second, simplify x - 9x + 10 + 11 to -8x + 10 + 11. / Your problem should look like: -8x + 10 + 11 = 12x + 3(-2x +  ).
Third, simplify -8x + 10 + 11 to -8x + 21. / Your problem should look like: -8x + 21 = 12x + 3(-2x +  ).
Fourth, expand. / Your problem should look like: -8x + 21 = 12x - 6x + 1.
Fifth, simplify 12x - 6x + 1 to 6x + 1./ Your problem should look like: -8x + 21 = 6x + 1.
Sixth, add 8x to both sides. / Your problem should look like: 21 = 6x + 1 + 8x.
Seventh, simplify 6x + 1 + 8x to 14x + 1. / Your problem should look like: 21 = 14x + 1.
Eighth, subtract 1 from both sides. / Your problem should look like: 21 - 1 = 14x.
Ninth, simplify 21 - 1 to 20. / Your problem should look like: 20 = 14x.
Tenth, divide both sides by 14. / Your problem should look like:  = x.
Eleventh, simplify  to  . / Your problem should look like:  = x.
Twelfth, switch sides. / Your problem should look like: x =  which is your answer.

The surface area would be 576 because you multiply all the numbers then multiply that number by 6