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If you would like to find the solution to the system of equations, you can do this using the following steps:

4c = 3d + 3
c = d - 1
___________
4 * (d - 1) = 3d + 3
4d - 4 = 3d + 3
4d - 3d = 3 + 4 
d = 7

c = d - 1 = 7 - 1 = 6

The correct result would be c = 6, d = 7.