Theorem 3p4e7

Description: 3 + 4 = 7. (Contributed by SN, 24-Aug-2026)

	Ref	Expression
Assertion	3p4e7	$$⊢3+4=7$$

Proof

Step	Hyp	Ref	Expression
1		3cn	$$⊢3\in ℂ$$
2		2cn	$$⊢2\in ℂ$$
3	1 2 2	addassi	$$⊢3+2+2=3+2+2$$
4		3p2e5	$$⊢3+2=5$$
5	4	oveq1i	$$⊢3+2+2=5+2$$
6		5p2e7	$$⊢5+2=7$$
7	5 6	eqtri	$$⊢3+2+2=7$$
8		2p2e4	$$⊢2+2=4$$
9	8	oveq2i	$$⊢3+2+2=3+4$$
10	3 7 9	3eqtr3ri	$$⊢3+4=7$$