exam Maths Puzzle Numerical Ability

Please help me solve this equation:
Add
(6+3x+9x2+8x3)+ (4-3x+9x2-8x3)

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exam Other Question

Please solve:
n+2(7+3n)-3n
which has the same value:
2(7+n)
n+14
14+3n
2(7+2n)
21n-3n

my answer is 2(7+2n) which will work out to be: 4n+14.
is this correct?
thanks. i have to find out when i answer this question is i have to round it to the nearest ten. heres the question if a=4 anb b=4 wat is c=? and one more question if b=7 and c=10 wat does a=? thank you for answering my questions.