Find the solution to the system of equations

3x+3y+3z=18

x+3y+3z=10

x-3y-4z=0

a. x=5, y=3, z=3

b. x=4, y=4, z=-2

c. x=-2, y=4, z=4

d. x=5, y=3, z=9

Many users of survey data, where numerical scales are associated with categories (i. e. 1=disagree, 2=neutral, 3=agree), treat it as interval data.

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