Question 934021
{{{ F = 1.8C + 32 }}}
This is the equation you have provided.
The information you have also provided tells us that C also represents the number of degrees in Celsius where degrees Fahrenheit and degree Celsius are the same.
Based on that information we can assume an equation such as:
{{{ C = F }}}
Since the statement provided tells us that degree Fahrenheit and degree Celsius are the same. Because of the assumption, we can substitute C in for F and begin solving.
{{{ F = 1.8F + 32 }}}
{{{ F - 1.8F = 1.8F - 1.8F + 32 }}} Subtraction Property of Equality
{{{ -0.8F = 32 }}}  Combine Like Terms
{{{ -0.8F/-0.8 = 32/-0.8 }}} Division Property of Equality
{{{ F = -40 }}}