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

6a/3xy + 2ab/5x^2y + 4b/2x^2 i tried to simplify this into a single fraction and came up with 60ax 12abx 60x^2y / 30x^2y lcd 30x^2y is this even close? How do you use tiles to solve a division and subtraction algebra equation?