exam Maths Puzzle Numerical Ability

I don;t know how to do that...

x cubed-27 divided by x cubed-3x squared+2x-6

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exam Other Question

x2+5x+6 Solve each of the following systems by substitution

5x - 2y = -5
y - 5x = 3

Please help, I understand the addition method but not the substitution