Question 671463
Starting with 
6z + 3 = 8z - 5
...
Isolate z
{{{6z + cross(3) - highlight(8z) - cross(3) = cross(8z) - 5 - cross(8z) - highlight(3)}}}
6z - 8z = -5 - 3
-2z = -8
...
Divide both sides by -2
{{{cross(-2)z/cross(-2) = -8/highlight(-2)}}}
{{{highlight_green(z = 4)}}}
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