book Maths Puzzle Numerical Ability

-12x+3=5--5x

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book Other Question

The number halfway between 6/7 and 1 is ___________. Can someone please explain how to solve quadratic inequalitities using sign charts. I has me a little confused and I have about 30 problems to do. Here is an example of one.

solve (x-5)(x+2)>0 using a sign chart.

Thanks Caroline