exam Maths Puzzle Numerical Ability

5n+1=5n-1

no solution?

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exam Other Question

Solve. Then Graph.

7x >_ 63 (The _ is supposed to be under the >)

Would the solution be {xlx<9} ?? AND
the graph be a hollow circle on the 9 and and arrow towards the numbers higher than 9? Am I even close?
If you pay 32% of your income in taxes and your income after taxes is $23,256, what is your gross (before taxes) income?

I tried 23,256 x 32% = 7,441.92
am I going in the right direction? My answer does not look correct