exam Maths Puzzle Numerical Ability

6x^2-2(5x-2x(3x+1))

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exam Other Question

find the x intercepts

y=x^2+x-6 I have a few questions like these in my college algebra book with no examples to help.

10-13/x=4+5/x

and

x/(x+4) + 4/(x+4) + 2= 0