Question 471217
in case you have this: 

{{{28/x - 28/(x-3)  = -3}}}....common denominator is {{{x(x-3)}}}

{{{28(x-3)/x(x-3) - 28x/x(x-3)  = -3}}}

{{{(28(x-3)- 28x)/x(x-3)  = -3}}}



{{{(28x-84- 28x)/(x^2-3x)  = -3}}}


{{{-84= -3(x^2-3x)}}}


{{{-3(x^2-3x)=-84}}}....both sides multiply by {{{-1}}}

{{{3(x^2-3x)=84}}}

{{{3x^2-9x-84=0}}}

{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}


{{{x = (-(-9) +- sqrt( (-9)^2-4*3*(-84) ))/(2*3) }}}


{{{x = (9 +- sqrt(81+1008))/6 }}}


{{{x = (9 +- sqrt(1089))/6 }}}


{{{x = (9 +- 33)/6 }}}

solutions:

{{{x = (9 + 33)/6 }}}

{{{x = 42/6 }}}

{{{x = 7 }}}

or

{{{x = (9 - 33)/6 }}}

{{{x = -24/6 }}}

{{{x = -4 }}}