Question 18965
5n=30+8n

tip: more means +. 
"is" or "same" USALLY means the = sign.
Now we could solve it.
Subtract 30 from each side
{{{5n-30=8n}}}
Now subtract 3n from sides
{{{-30=3n}}}
Divide 3 from each side
{{{-30/3=3n/3}}}
{{{-10=n}}}
Check.
-50=30+-80
-50=-50