exam Maths Puzzle Numerical Ability

eight less thn half a number is seven more than two thirds of the number. find the number

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(3/x+3) + 1 = (7/x+3) I just asked a question but was slightly wrong,here is the correct wording: If f(x)=x(x+3)(x-1), use interval notation to give all values of x where f(x) is greater than 0. The last email said less than 0,I typed it wrong. Thanx