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merubah C ke F :
(9/5 × C)+32
C = (9/5 × C)+32
C - 32 = 9/5 × C
5(C - 32) = 9 × C
5C - 160 = 9C
5C - 9C = 160
-4C = 160
C = 160÷(-4)
C = -40° (B)