What is 78 over 126 simplifying?

To simplify the fraction 78/126, we can find the greatest common factor (GCF) of the numerator and denominator and divide both by the GCF.

The GCF of 78 and 126 is 6.

So, 78/126 simplifies to (78 ÷ 6)/(126 ÷ 6) = 13/21.