方程式!!急!!幫我解方程式！！

1. 7[5(x-3)+12=5[7-4(x+5)] {係咪少左個中括號呀??}

2. 2[6p-5(6p+8)]-6=4p+70
2(6p-30p-40)-6=4p+70
12p-60p-80-6=4p+70
-48p-86=4p+70
-48p-4p=70+86
-52p=156
p=-3

3. 5[3p-4(3p+3)]-4=5p+36
5(3p-12p-12)-4=5p+36
15p-60p-60-4=5p+36
-45p-64=5p+36
-45p-5p=36+64
-50p=100
p=-2

4. 2[8p-5(2p+3)]-17=29+13
2(8p-10p-15)-17=42
16p-20p-30-17=42
-4p-47=42
-4p=42+47
-4p=89
p=-22.25

6. 6x-4x-8
=2x-8

7. b
　 ─ -2(5-b)=-23
　 6

b
　 ─ -10+2b=-23
　 6

b
　 ─ +2b=-23+10
　 6

b +12b
　 ─── =-13
　 6

13b
　 ─ =-13
6

13b=-13x6
13b=-78
b=-6

1.
7[5(x-3)+12]=5[7-4(x+5)]
7(5x-15+12) =5(7-4x-20)
7(5x-3)=5(-13-4x)
35x-21=-65-20x
55x=44
x=4/5


2.
2[6p-5(6p+8)]-6=4p+70
(6p-30p-40)=2p+38
-24p-40=2p+38
26p=78
p=3

3.
5[3p-4(3p+3)]-4=5p+36
5(3p-12p-12)=5p+40
-9p-12=p+8
p=-2

4.
2[8p-5(2p+3)]-17=29+13
2(8p-10p-15)=59
-4p-30=59
p=-89/4

6.
6x-4x-8
　 　 ── =12
　　　３
2x-8=36
x=22

7.
b
　 ─ -2(5-b)=-23
　 6
b/6 -10+2b=-23
b-60+12b=-138
13b=-78
b=-6


8.
1 　1 　　　　　3 　5-3n
　 ─ [─(n+2)-3]=　─ + ─
　 4 　3　　　　　 2　 4
(n/3+2/3-3) / 4 =3/2 + (5-3n)/4
n/3+2/3-3 =6 +5-3n
n+2-9=18+15-9n
10n=40
n=4