３條代數方程式！要過程！

7q = 15 + 11q - 3
7q = 15 -3 + 11q
7q = 12 + 11q
7q - 11q = 12
-4q = 12
q = 12/(-4)
q = -3

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

7 + 2e = 9e -14 - 6e
2e = 9e - 6e -14 -7
2e = 3e -7
2e -3e = -7
-e = -7
e = 7

7q=15+11q-3
7q = 12+11q
-12 = 4q
q = -3


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

　7+2e=9e-14-6e
7+2e = 3e -14
21 = e
e = 21

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

=========7q=15+11q-3=========
7q-11q=15+3
-4q=18
4q= -18
q=(-18)/4
q= -4.5
===========================

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

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

　7q=15+11q-3

7q-11q=15-+11q-3-11q
-4q=12
(-4q)/-4=12/-4
q=-3

　2p+1=0.4p+9

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

　7+2e=9e-14-6e

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

7q=15+11q-3
4q=18
q=9/2

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

7+2e=9e-14-6e
7+2e=3e-14
21=e
e=21