The article presents the equivalence of the inhomogeneous Maxwell’s system and Einstein’s equations. The proof showed that gravity and electromagnetism are different forms of the same phenomenon, a more general law. These two different equations are unified in the generalized Clifford algebra -based formalism. Two derivation ways of Einstein’s equations are shown:
a) fFrom the so-called unified equation of electromagnetism as direct method; .
b) fFrom the continuity equation, i.e., from the conservation law of 4-D electromagnetic current as reverse method.