exam Maths Puzzle Numerical Ability

Hi,

I need help with the following, I need to simplify it:

8 – {3x + 9y – (2x – y) + 8x + 5y}

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exam Other Question

how do you know when an equation has infinitely many solutions A card is drawn from a standard deck of 52 playing cards. Find the probability that the card is an ace or a black card.