我想問幾題中一maths

1. 2b-6=b+7
2b-6-b=7
2b-b-6=7
b-6=7
b=7+6
=13

2. 2p+1=0.4p+9
2p-0.4p+1=9
1.6p=9-1
=8
1.6p/1.6=8/1.6
p=5

3. 6m+4m-2=8+5m
10m-2=8+5m
10m-5m-2=8
5m=8+2
5m=10
m=2

4. 7+2e=9e-14-6e
7+2e-9e+6e=-14
-e=-14-7
-e=-21
-e/-1=-21/-1
e=21

5. 5y-4(3y-2)= -20
5y-12y+8=-20
-7y+8=-20
-7y=-20-8
-7y/-1=-28/-1
7y=28
y=4

1. 2b-6=b+7
2b-b=6+7
b=13

2. 2p+1=0.4p+9
2p-0.4p=9-1
1.6p=8
p=5

3. 6m+4m-2=8+5m
10m-5m=8+2
5m=10
m=2

4. 7+2e=9e-14-6e
2e-9e+6e=-14-7
-e=-21
e=21

5. 5y-4(3y-2)= -20
5y-12y+8=-20
7y=-20-8
7y=12
y=12/7

2b-6=b+7
2b-b=6+7
b=13

2p+1=0.4p+9
2p-0.4p=9-1
1.6p=8
p=5

6m+4m-2=8+5m
10m-5m=8+2
5m=10
m=2

7+2e=9e-14-6e
2e-9e+6e=-14-7
-e=-21
e=21

5y-4(3y-2)= -20
5y-12y+8=-20
7y=-20-8
7y=12
y=12/7