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Answer:
x = -6.
Step-by-step explanation:
Given:
Cube both sides:
5x - 4 = 7x + 8
Subtract 5x from both sides:
-4 = 2x + 8
Subtract 8 from both sides:
-12 = 2x
x = -6.
X+y+z=75x-4y-2z=2 4x+2y-3z=42
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