Maths - Properties of Planes

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write a scalar equation, given it's vector equation.
[x,y,z]= [3,7,-5] + s[1,2,-1] + t[5,-2,3]

( I remember my teacher saying that you have to cross s and t, and that will be my normal and thereafter I substitue the point to find the 'D' value of the scalar equation, but when I try it, it does not give me the answer? Is my method wrong?)

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