Answer: z=-4.25
Step-by-step explanation: Assuming that 8.5+2z=0, you would first subtract 8.5 from both sides, resulting in 2z=-8.5. Then divide both sides by 2, leaving z=-4.25
Explanation:
z = 8
5 + 2z
5 + 2 × 8
5 + 16
21
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