book Maths Puzzle Numerical Ability

solving for x:
13.7b-6.5= -2.3b+8.3

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book Other Question

You are considering an investment that will pay you $100 in Year 1, $500 in Year 2, $0 in Year 3 and $600 in Year 4. If you require a 12% return, what is the most you should pay solve /x/= 7
^absolute value
and...
solve /x/= -9

and...
solve and graph /x+5/<= 2