Determine (in terms of an inequality) those in celsius temperatures for which the metal stays soild

Question

A metal stays at a solid at Fahrenheit temperatures below 1769.2. Determine ( in terms of an inequality) go Celsius temperatures for which metals stay solid. Use the Formula F=9/5C+32.

Answer 1

C=(F+40)*5/9-40

C=(1769.2+40)*5/9-40=1809.2*5/9-40=1005 1/9-40=965 1/9

The formula I wrote has the delightful symmetry in that

F=(C+40)*9/5-40