Question 666190
Starting with 
13 + 7n = 1 + (5n)
...
Group n on one side
{{{cross(13) + 7n - cross(13) - highlight(5n) = 1 + cross(5n) - cross(5n) - highlight(13)}}}
Yielding
7n - 5n = 1 -13
Combine like terms
2n = -12
...
Divide both sides by 2
{{{1cross(2)n/cross(2) = -12/2}}}
{{{highlight_green(n = (-12/2) = -6)}}}
.....................
Delighted to help.
-Reading Boosters
Wanting for others what we want for ourselves.
www.MyHomeworkAnswers.com