3(x + 4)
Distributive property
= 3(x) + 3(4)
= 2x + 12
x + 2(x+6)
= x + 2(x) + 2(6)
= x + 2x + 12
Combine like terms
= 3x + 12
So
3(x + 4) = x + 2(x+6) = 3x + 12
Answer: 3x + 12
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