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(1/2)*x+6 = c/2-3*x // - c/2-3*x
(1/2)*x-(c/2)-(-3*x)+6 = 0
(1/2)*x-(c/2)+3*x+6 = 0
7/2*x-1/2*c+6 = 0 // - 6-1/2*c
7/2*x = -(6-1/2*c) // : 7/2
x = (-(6-1/2*c))/7/2
x = -2/7*(6-1/2*c)
x = -2/7*(6-1/2*c)
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