1.
3n + 5 = 6
3n = 6 - 5
3n = 1
n = 1/3
2.
4 + 5x = 1
5x = 1 - 4
5x = -3
x = -3/5
3.
4y - 15 = -10
4y = -10 + 15
4y = 5
y = 5/4
4.
3 - 4d = 13
-4d = 13 - 3
-4d = 10
d = -10/4
d = -5/2
5.
8 = 9x - 7
8 + 7 = 9x
15 = 9x
15/9 = x
5/3 = x
hope this helped, God bless!
