book Maths Puzzle Numerical Ability

I have been unable to solve the following:
-10 = 1/2x + x
Is the answer 20/2?

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book Other Question

give the coordinates of the focus and the equation of the directrix for the parabola with equation x=-4y^2 For the following piecewise defined function find f(-1)

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

Help, please...