book Maths Puzzle Numerical Ability

Please help me solve this problem.
19-(2x+3)=2(x+3)+x
I tried but my answer was wrong
19-2x+3=2x+6+x
22-2x=3x+6
22-2x+-3x=3x+-3x+6
22-5x=6
22-22-5x=22-6
-5x=-16
x=-16/5

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book Other Question

Expand and simplify (2-(1/n))^6

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