Answer:

Step-by-step explanation:

Expand parentheses:

Subtract 42 from both sides:

Divide both sides by 14:

Hope this helps!
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What sets are you talking about
Answer:
3000 cm^3.
Step-by-step explanation:
If the top number is 15 it's
15 * 20 * 10
= 3000 cm^3.