Question 671243
4n = 2n - 6
...
{{{4n - highlight(2n) = cross(2n) - 6 - cross(2n)}}}
4n - 2n = -6
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2n = -6
...
{{{cross(2)n/cross(2) = - 6/highlight(2)}}}
{{{highlight_green(n = -3)}}}
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