Theorem mvrladdd

Description: Move RHS left addition to LHS. (Contributed by David A. Wheeler, 11-Oct-2018)

	Ref	Expression
Hypotheses	mvrraddd.1	|- ( ph -> B e. CC )
	mvrraddd.2	|- ( ph -> C e. CC )
	mvrraddd.3	|- ( ph -> A = ( B + C ) )
Assertion	mvrladdd	|- ( ph -> ( A - B ) = C )

Proof

Step	Hyp	Ref	Expression
1		mvrraddd.1	|- ( ph -> B e. CC )
2		mvrraddd.2	|- ( ph -> C e. CC )
3		mvrraddd.3	|- ( ph -> A = ( B + C ) )
4	1 2 3	comraddd	|- ( ph -> A = ( C + B ) )
5	2 1 4	mvrraddd	|- ( ph -> ( A - B ) = C )