Respuesta :

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[tex]f=\dfrac{d-c}{c-e}[/tex]


Multiply both sides by [tex](c-e):[/tex]

[tex]f\cdot (c-e)=d-c\\ \\ fc-fe=d-c\\ \\ fc+c=d+fe\\ \\ (f+1)\cdot c=d+fe\\ \\ \boxed{\begin{array}{l} c=\dfrac{d+fe}{f+1} \end{array}}[/tex]

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