book Maths Puzzle Numerical Ability

/2x-1/=11

-4/x+1/=-20

/3x-9/>3 graph

-3+/x-1/<=-1 graph
help please

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book Other Question

base 1 of R to the (R-1) power. i could really use someones help with this one! translate "nine less than the total of five and a number"into a mathematical expression. thanks!