Good evening ,
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Answer:
Yes ,it remains true.
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Step-by-step explanation:
e.g:
x + 12 ≤ 2021 ⇔ (x + 12) ≤ 2021 - 2 ⇔ x + 10 ≤ 2019
:)
They will deliver on the same day again 21 days later
Multiples of 3 and 7
3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30
7: 7, 14, 21, 28, 35, 42, 49
