# Proof using real number axioms and axioms of equality: a/b+c/d=ad+bc/bd Show reason in every proof

Eric Bizzell | Certified Educator

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`a/b+c/d` is given

Since `d/d=1` and `b/b=1` by the multiplicative inverse axiom we have:

`a/b+c/d=a/b * d/d + b/b*c/d`      by the multiplicative identity axiom