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If f = -19 when m = 14 then, when m = 2, f = -19/7.
-19°C = -2.2°F: -19°C multiplied by 1.8 +32 = -2.2°F
19°f=-7.22°c
19 = f + 5
Subtract 5 from both sides: 14 = f
-6 + f = 13
f = 13 + 6
f = 19