Question 22704
You will need to get the variable c onto one side of the equation.

{{{-5+2c = 6c+11}}} Subtract 2c from both sides of the equation.
{{{-5 = 4c+11}}} Subtract 11 from both sides.
{{{-16 = 4c}}} Finally, divide both sides by 4.
{{{c = -4}}}