Explicación paso a paso:
4 z + 8 + 5 z = 7 z - 4
4z + 5z - 7z = -4 -8
2z = -12
z = -6
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Explicación paso a paso:
4 z + 8 + 5 z = 7 z - 4
4z + 5z - 7z = -4 -8
2z = -12
z = -6