Question 197478
It has to equal something to solve it, like:
{{{ 1/a+2/b+3/c = 407}}}
It can't be solved the way it is.
For an equation with 3 unknowns, you need
2 more equations to solve it.
If you know what any 2 of the unknowns are,
you can solve for the remaining one.
{{{a = 3}}}
{{{b = 7}}}
{{{1/3 + 2/7 + 3/c = 407}}}
Multiply both sides by {{{21c}}}. The is the common denominator
{{{7c + 6c + 63 = 407}}}
{{{13c = 344}}}
{{{c = 26.461}}}