exam Maths Puzzle Numerical Ability

Please help solve. Decide which method you should use to solve each absolute value equation or ineguality. Find the solution set. for both these problems

/x/-1=4

and

/x+4/+1=2

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exam Other Question

I am asked to write a formula for the Nth term of:
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If one angle of a triangle is tree times a second angle and the third angle is 20 degrees more than the second angle, the SECOND ANGLE is.....