Find all values of c such that c/(c - 5) = 4/(c - 1). If you find more than one solution, then list the solutions you find separated by commas.
Cross-multiply. You will get:
c(c−1)=4(c−5)
Now expand both sides, and move all terms to the left-hand side. You will get a quadratic equation. Then you can solve it with the quadratic formula.
