exam Maths Puzzle Numerical Ability

Hello, I was wondering if you could help me with this problem.
4q+19=5/6q

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exam Other Question

two x squared plus 12 x plus k (k is greater than 0) there should be three answers to this questions and i can only figure one answer (18) Another question:
Find the zero of the following function
f(x)=6x+3

Thank you,
Jass