book Maths Puzzle Numerical Ability

1/2x+2/x-1=3 I need your help in solving this equation

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Hi My problem is this:

2[3/(19-4^2)] solve.
you have to show each step.
also when you show each step you have to show
the property and i dont understand properties that mu 1. Find the projection of the vector v1= (0,1,1) onto the line defined by the vector v2= (1,1,0)

2i) Find an orthogonal basis of the subspaces span (v1,v2), where v1 and v2 are