Respuesta :

-5c + d = 2c         Subtract d from both sides
      -5c = 2c - d    Subtract 2c from both sides
      -7c = -d          Divide both sides by -7
         c = [tex] \frac{-d}{-7} [/tex]   Cancel out the [tex] \frac{-1}{-1} [/tex]
         c = [tex] \frac{d}{7} [/tex]
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