Theorem 2p5e7

Description: 2 + 5 = 7. (Contributed by SN, 24-Aug-2026)

	Ref	Expression
Assertion	2p5e7	$$⊢2+5=7$$

Proof

Step	Hyp	Ref	Expression
1		2cn	$$⊢2\in ℂ$$
2		3cn	$$⊢3\in ℂ$$
3	1 2 1	addassi	$$⊢2+3+2=2+3+2$$
4		2p3e5	$$⊢2+3=5$$
5	4	oveq1i	$$⊢2+3+2=5+2$$
6		5p2e7	$$⊢5+2=7$$
7	5 6	eqtri	$$⊢2+3+2=7$$
8		3p2e5	$$⊢3+2=5$$
9	8	oveq2i	$$⊢2+3+2=2+5$$
10	3 7 9	3eqtr3ri	$$⊢2+5=7$$