Step |
Hyp |
Ref |
Expression |
1 |
|
readdcl |
|
2 |
1
|
3adant1 |
|
3 |
|
rersubcl |
|
4 |
3
|
3adant3 |
|
5 |
|
simp3 |
|
6 |
|
rersubcl |
|
7 |
4 5 6
|
syl2anc |
|
8 |
|
simp2 |
|
9 |
8
|
recnd |
|
10 |
5
|
recnd |
|
11 |
7
|
recnd |
|
12 |
9 10 11
|
addassd |
|
13 |
|
repncan3 |
|
14 |
5 4 13
|
syl2anc |
|
15 |
14
|
oveq2d |
|
16 |
|
simp1 |
|
17 |
|
repncan3 |
|
18 |
8 16 17
|
syl2anc |
|
19 |
12 15 18
|
3eqtrd |
|
20 |
2 7 19
|
reladdrsub |
|