Solve multi-step linear equations, including equations requiring simplification first.
Choose a specified simplification and solve
Problem
For \(3(x~+~2)~+~x~=~18\), which complete response is correct? Candidate A distributes \(3\), B combines \(x~+~2\) as \(2x\), and C divides \(\text{every}~\text{term}\) by \(3\).
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What this problem is really about
The specified first move is to remove the parentheses by distribution. Multiply three by both the variable and the constant inside the group; combining x with a constant is not legitimate. After expansion, combine the two variable terms, then use inverse operations and check the original grouped equation.
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