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let w+x = 8
y-z = 6
w+y = 13
x+z = 8
w+x = x+z
w = z --------(1)
now,
w+y = 13
-w+y = 6
2y = 19
y = 9.5 -------(2)
putting in y-z = 6
z = 3.5 = w -------(3)
putting in w+x = 8
x = 4.5 -----(4)
:-
3.5 + 4.5 = 8
+ +
9.5 - 3.5 = 6
II II
13 8
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