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That is because F = 9/5 C + 32

for F and C to be the same, F = C, solve:

F = C = 9/5 C +32

C -9/5 C = 32

-4/5C = 32

C = -5/4 (32) = -40

F = C = -40

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Q: How is minus 40 the same in F and C degrees?
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