exam Maths Puzzle Numerical Ability

please help me with this problem.

1) 5=|2x/7 + 4/7| -3

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exam Other Question

If the circle with centre(0,m) has equation x^2+y^2+6y+5=0, what is the value of m? 3y2=5y-8=0 that should read 3y squared. I have to solve the equation(i.e. x=4 or 6)