In a Transformer - Alternating current flows in primary winding

Causing alternating magnetic field in Iron core

Which causes alternating voltage in secondary coil.

But I am confused that what would be the polarity of the Flux caused by the secondary winding voltage.

Won't the Flux caused by the secondary voltage cancel the Flux caused by the primary voltage and thus making the net Flux zero in the coil if both the primary and secondary windings have the same number of turns?