No, but if it's an improper fraction it should be done
-18+4x
2(2x-9)
4x=18
-4x=-18
x=18/4
-x=-18/4
Get the app Symbolab, it helped me when I was learning about logarithms.
The answer is x=10
The equation would be d - 19 = 73. So the zoologist would take the number of deer recorded and subtract it from 19 (since it said 19 fewer deer) and the answer would be 73 (because that is how many deer were recorded a year later. I hope this helps!