請替我解以下方程,20分!!

1）
8y+4 = 6y-8
2y = -12
y = -6


2)
y+5/2 - y/7 = 0
(y+5/2 - y/7)*14 = 0
14y + 35 - 2y = 0
12y = -35
y = -35/12

3)
s+7/2 - 3s/8 = 11
16s + 56 - 6s = 11*16
10s = 176-56
s = 120*10
s = 12

4)
3x+4/5 = 2x+7 /3
45x + 12 = 30x + 35
15x = 23
x = 23/15


5)
3t-t-6/12 = 18
2t - 6/12 = 18
24t - 6 = 216
t = 222/24
t = 37/4

6)
1/12 + 1/v = 4
(1/12 + 1/v)*12v = 4*12v
v + 12 = 48v
v = 12/47