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a)C=10°C
F=9/5×C+32
F=50°F
b)F=85°F
C=5/9(85-32)
C=5/9×53
C=29.44°C
c)C=F
F=9/5×F+32
F-32=9/5 F
F-32/F=9/5
-32/F=9/5-1
-32/F=4/5
1/F=-1/40
F=C= (-40)
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