book Maths Puzzle Numerical Ability

w+3-(-8+w)
????
Please help

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How do I divide this equation using a+bi form 6/2+4i i am having problems with the slopes in graphing equations. i have
(4,5) (2,3)
m=3-52-4 = -2-2
now i am suppose to write weather the line is vertical or horizontal....how do