book Maths Puzzle Numerical Ability

Express in Simpliest Form without negative exponents:
x/x-1 - 2/x^2-1

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book Other Question

can you show me how to work the following problem:

3/2y - y = 4 + 1/2y
how do you identify funktions?



can you show me how to do this problem

the rule: evaluate the function f(x)=3x-10 for the given value of the variable.
x=-2
can you show me how to do it please!!!