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F = (9/5 x C) + 32
jika
F = C ,maka
F = (9/5 x F) + 32
kedua ruas dikurangi (9/5 x F)
F - (9/5 x F) = 32
-4/5 F = 32 <------ -4/5F didapat dari F - 9/5F
F = 32 x -5/4
F = -40
semoga membantu