exam Maths Puzzle Numerical Ability

Please help to add :

5/x + 6/x^2 - 4 - 3x / 2 - x

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exam Other Question

Determine wheather the system is independent, inconsistent, or dependent.

y=x+5
y=5-x Can you please explain how I could go about solving this problem?

1.3 x 10^-12 / 2