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Comencemos con las ecuaciones que solo tienen una variable.
4z = -8
z = -2
5x + 2z = 6
5x + 2(-2) = 6
5x -4 = 6
5x = 6 + 4
5x = 10
x = 2
2x + y - 32 = 8
2(2) + y - 32 = 8
4 + y - 32 = 8
y -28 = 8
y = 8 + 28
Y = 36