exam Maths Puzzle Numerical Ability

7-2n=n-14 Can you help me finging the solution The type of question is equation with variables on both sides. my answer was -21 I am not sure if i am right.

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exam Other Question

Solve the problem using the substitution method. 3a-b/4=a+1 and 5a+b/2=a When 3 times a certain number N is added to 6, the sum is 20 more than the original number. What is the number N?