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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The difference between two whole numbers is 8 and the difference between their reciprocals is 1/6. Find the two numbers. THERE ARE 850 DOUGLAS FIR AND PONDEROSA PINE TREES IN A SECTION OF FOREST BOUGHT BY LOGGING COMPANY. THE COMPANY PAID AN AVERAGE OF $300 FOR EACH DOUGLAS FIR AND $225 FOR EACH PON