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86 deg F = 30 deg C

So the temperature has changed from -18 deg C to 30 deg C, an increase of 48 deg.

Conversely,

-18 deg C = -0.4 deg F

So the temperature has changed from -0.4 deg F to 86 deg F, an increase of 86.4 deg.

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Q: How do you subtract negative 18 degree celsius from 86 degree Fahrenheit?
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