To solve the equation \( 3(x − 4) = 18 \), we can follow a few different methods. Let's evaluate the provided options to determine which ones are valid:
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First, distribute the 3, then add 12, and lastly divide by 3.
- Distributing gives \( 3x - 12 = 18 \). Then adding 12 results in \( 3x = 30 \). Dividing by 3 gives \( x = 10 \). This method is correct.
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First, multiply by 13, then subtract 4.
- This method does not relate correctly to the equation and would not yield a solution. This method is incorrect.
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First, multiply by \( \frac{1}{3} \), then subtract 4.
- This would give us \( (x - 4) = 6 \) after multiplication, and the subtraction does not yield the correct answer. This method is incorrect.
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First, distribute the 3, then add 4, and lastly divide by 3.
- After distributing, we have \( 3x - 12 = 18 \). Adding 4 gives \( 3x - 8 = 18 \), and this does not lead to the correct answer. This method is incorrect.
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First, divide by 3, then subtract 4.
- Dividing gives \( x - 4 = 6 \). Subtracting 4 leads to \( x = 10 \). This method is correct.
The methods that result in the correct answer are:
- First, distribute the 3, then add 12, and lastly divide by 3.
- First, divide by 3, then subtract 4.
Thus, the first option is valid, and the last option is also valid.