exam Maths Puzzle Numerical Ability

Can someone help me on this problem?

I need to solve and show proof on the following equation:

5x + 8 + 3x -x + 5 = 6x -3

Thanks,
Lisa

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exam Other Question
Find the standard diviation of the data set to the nearest tenth:
(21,13,18,16,13,35,12,8,15).

Thank You can you please help me: (((Graph the function y=f(x)=x^2)))