Exam Maths Puzzle Algebra

How do you solve this equation?
1/(x-1) + 2/x = x/(x-1)

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Exam Other Question

In a party attended by boys and girls where the girls outnumbered the boys Rs 280 was distributed. Each boy was given Rs 10 and each girl Rs 20. How many boys are there? For the following piecewise defined function find f(1)

f(x) = {x^2=1,.....x<0
f(x) = {x-1,.......x>0