exam Maths Puzzle Numerical Ability

(3 1/2-1)/1 3/5=

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I need help.
#1
find the parametric equations for line passing through the points P(5,-2,4) Q(7,2,-4).
#2
show that if v is a nonzero vector, then v/ llvll is a unit vector for i= square root -1, if 3i(2+5i)=x+6i, then x=?