exam Maths Puzzle Numerical Ability

solve please 3(x-2)sqrt-9=0 andsolve 2/3-3/x=1/x-6 help

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exam Other Question

Can someone please explain the System of linear equation by substitution. Thank you

5X + 2Y = -1
2X - y = -13 Any help on this problem would be great...;)

4x^2-12x-40 divided by 2^2-16+30

I came out with x+2 divided x+3...Is that correct?