Theorem comraddi

Description: Commute RHS addition. See addcomli to commute addition on LHS. (Contributed by David A. Wheeler, 11-Oct-2018)

	Ref	Expression
Hypotheses	comraddi.1	$$⊢B\in ℂ$$
	comraddi.2	$$⊢C\in ℂ$$
	comraddi.3	$$⊢A=B+C$$
Assertion	comraddi	$$⊢A=C+B$$

Proof

Step	Hyp	Ref	Expression
1		comraddi.1	$$⊢B\in ℂ$$
2		comraddi.2	$$⊢C\in ℂ$$
3		comraddi.3	$$⊢A=B+C$$
4	1 2	addcomi	$$⊢B+C=C+B$$
5	3 4	eqtri	$$⊢A=C+B$$