exam Maths Puzzle Numerical Ability

Solve 3x(to the 3rd)+7x(squared)-22x-8=0, given that negative one third is a solution.

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exam Other Question

find the diameter
circumference=283m
I know the formula:d=C/pi
but need step by step help in decimals divided by whole numbers Can someone help me on this?

Is -4 a solution to the equation: 7x -5 + 3x = 6 + x - 10

Thanks,
Asley