Question

Determina el valor fe n
-(4+n)=5
-n=10
-n+11=4
-11+n=4
-(5-n)=7

Answer 1

-4-n=5
-4-5=n
-9=n

-n=10 (-1)
n=-10

-n+11=4
11-4=n
7=n

-(5-n)=7
-5+n=7
n=7+5
n=12