if X+Y=10,Z+X=24,Y+Z=20 then X+Y+Z=?

It is little complicated and very confusing so please help to solve
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3 Answers

1.... x+y=10

2....x+z=24

3....y+z=20

2-3...x-y=4

1+2-3...2x=14, so x=7 & y=3

2...x+z=24, or 7+z=24, so z=24-7=17
by
x+y+x+z+y+z=10+20+24

2x+2y+2z=54

x+y+z = 54/2

x+y+z=27
by
x=7
y=3
z=17
x+y+z = 27
by

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