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z = -8/4 = -2
Ya tenemos una de las incógnitas, z = -2
5x + 2*(-2) = 6
5x - 4 = 6
5x = 6 +4
5x = 10
x = 10/5 = 2
La segunda incógnita, x = 2
2*2 + y - 32 = 8
4 - 32 + y = 8
-28 + y = 8
y = 8 + 28
y = 36