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X+2*x-(9/2)-6 = c // - c
X-c+2*x-(9/2)-6 = 0
X-c+2*x-9/2-6 = 0
X-c+2*x-21/2 = 0 // - X-c-21/2
2*x = -(X-c-21/2) // : 2
x = (-(X-c-21/2))/2
x = (c-X+21/2)/2
x = (c-X+21/2)/2
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