exam Maths Puzzle Numerical Ability

Slove :

7X+5Y=23
3X-Y=4

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exam Other Question

Please help me solve the following problem:

Find all the real zeros of {{{3x^4 + 3x^3 -17x^2 + x - 6 =0}}}

Thank You please show me how to do this.
. Rationalize the denominator:
2/√[6] - √[5]