In class we corrected are algebra homework.
(Question )
(answer)
7+A=10
-7+7+A=10-7
A=3
Verify
A+7=10
3+7=10
10=10

B-4=3
b -4+4=3+4
B-7
Verify
B-4=3
7-4=3
3=3
4-B=3
B-4-4=3-4
(Question )
(answer)
7+A=10
-7+7+A=10-7
A=3
Verify
A+7=10
3+7=10
10=10

B-4=3
b -4+4=3+4
B-7
Verify
B-4=3
7-4=3
3=3
4-B=3
B-4-4=3-4
Verify
4C=12
4C/4 12/4
Verify
4C=12
4(3)=12
12=12
4C=12
4C/4 12/4
Verify
4C=12
4(3)=12
12=12
C4=12
C4/4 12/4
verify
C4=12
(3) 4 =12
12=12
C4/4 12/4
verify
C4=12
(3) 4 =12
12=12
(sorry if it's so short)