exam Maths Puzzle Numerical Ability

Solve for and check the solution x/4 =-4

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exam Other Question

Please help me with the following problem:
Solve the problem. Solve the equation 12x�-77x�+91x-30=0 given that 2/3 is a root

Thanks in advance using the unit circle, find the value of the trigonometric function:
tan pi over 6