exam Maths Puzzle Numerical Ability

how do you know when an equation has infinitely many solutions

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You have been invited to present statistical information at a conference. To prepare, you must perform the following tasks:

1. The following data was retrieved from www.cdc.g
Hi,

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

8 – {3x + 9y – (2x – y) + 8x + 5y}