Answer
-40°
Work Step by Step
F = $\frac{9}{5}$C + 32
If F = C,
F = $\frac{9}{5}$F + 32
F – $\frac{9}{5}$F = 32
-$\frac{4}{5}$F = 32
F = 32 x -$\frac{5}{4}$
F = -40°
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