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Answer the questions below about Line 1 and Line 2 shown below. $$\begin{array}{l} (6+7)+3 \\ 6+(7+3) \end{array}$$ Line 1 Line 2
Answer Attempt 1 out of 2
The expression was rewritten using the $(6+7)+3$ equals $\square$ +3 which equals $\square$ 7. $6+(7+3)$ equals $6+$ $\qquad$ which equals $\square$ .