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Answer:
[tex]x \ge51[/tex]
Step-by-step explanation:
Let [tex]x[/tex] be the number of envelopes Sani has left to address. He has already addressed 17 of them, so he had [tex]x+17[/tex] total envelopes to address. We know he had at least 68 envelopes to address, so [tex]x+17[/tex] is at least 68.
Writing this as an inequality, we have
[tex]x+17 \ge 68[/tex].
Subtracting 17 from both sides gives
[tex]x \ge51[/tex].