Theorem oveq123i

Description: Equality inference for operation value. (Contributed by FL, 11-Jul-2010)

	Ref	Expression
Hypotheses	oveq123i.1	$$⊢A=C$$
	oveq123i.2	$$⊢B=D$$
	oveq123i.3	$$⊢F=G$$
Assertion	oveq123i	$$⊢AFB=CGD$$

Proof

Step	Hyp	Ref	Expression
1		oveq123i.1	$$⊢A=C$$
2		oveq123i.2	$$⊢B=D$$
3		oveq123i.3	$$⊢F=G$$
4	1 2	oveq12i	$$⊢AFB=CFD$$
5	3	oveqi	$$⊢CFD=CGD$$
6	4 5	eqtri	$$⊢AFB=CGD$$