Equation e: c = 2d + 1
equation f: c = 3d + 7
which statement describes a step that can be used to find the solution to the set of equations?
equation f can be written as c = 3(c − 1) + 7.
equation f can be written as c = 2(c − 7) + 1.
equation f can be written as d + 1 = 3d + 7.
equation f can be written as 2d + 1 = 3d + 7.