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The temperature in most fridges range a little bit, but usually run refrigerator is 36 to 46 °F and 0 °F for the freezer.
3 - f = 6f + 46
+f to both sides
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3 = 7f + 46
- 46 to both sides
-43 = 7f
÷7 to both sides
-43/7 = f
Generally 2 to 8 °C (36 to 46 °F) is ideal for the refrigerator compartment and -18 °C (0 °F) for the freezer.
46 c = 114.8 f
Let f = 0.46 recurring ie
f = 0.464646...
Then
100*f = 46.464646...
Subtract the second equation from the first: 99*f = 46
so that f = 46/99