5,9 + 15 + ( -1,39n ) = 0 + 5,9 - 6,39n
5,9 + 15 + ( -1,39n ) = 5,9 - 6,39n
15 - 1,39n = -6,39n
-1,39n + 6,39n = -15
5n = -15
n = -3
5,9 + 15 + ( -1,39n ) = 0 + 5,9 - 6,39n
5,9 + 15 + ( -1,39n ) = 5,9 - 6,39n
15 - 1,39n = -6,39n
-1,39n + 6,39n = -15
5n = -15
n = -3