Solving for blank, trying to help my daughter and I am not quite clear
2(n+4) = (2x_)+(_x4)
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It looks like your daughter's math class is learning the distributive property.
It looks like this format:
a(b + c) = a•b + a•c
Here is an example:
3(m + 7) = 3•m + 3•7
I hope this helps you see what to do for your daughter's problem.