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n-11=4+n
First get the variable on the same side, subtract both sides by n;

n-11-n=4+n-n

n-11=4
now add 11 to both sodes;

n-11+11=4+11

n=15
Now multiply both sides by the inverse of

which is

;

n(

)=15(

)
n=-45
Now check your answer;

(-45)-11=4+-45

-11=-41
-30-11=-41
-41=-41
Checks out!!!
Hope you understand
=)