prove celcius scale is same on frahenit scale in -40°
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F-32/9=C/5
F-32/9=-40/5
5(F-32)=9×(-40)
5F-160=-360
5F=-360+160
5F=-200
F=-200/5
F=-40
F-32/9=-40/5
5(F-32)=9×(-40)
5F-160=-360
5F=-360+160
5F=-200
F=-200/5
F=-40
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