Question

what number can you add to the numerator and denominator of 7/9 to get 1/2?

Answer 1

(7+x)/(9+x) = 1/2

x = -5

check: (7-5)/(9-5) = 2/4 = 1/2 ✅

Answer 2

(7+x)/(9+x) = 1/2

14+2x = 9+x
x = -5

check:
7-5=2
9-5 = 4
and 2/4 = 1/2

The number to be added is -5