exam Maths Puzzle Numerical Ability

6e^3x-6=18

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exam Other Question

PLEASE HELP ME FIND THE ANSWER TO: 7X+15Y=39 X-3Y=-20
THE CHAPTER IS CALLED SOLVING SYSTEMS USING ELIMINATION 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.