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X-((1/2)*(x-4))-x-5 = 0
(-1/2)*(x-4)+X-x-5 = 0
X-1/2*(x-4)-x-5 = 0
X-1/2*(x-4)-x-5 = 0
X-1/2*x-x-5+2 = 0
X-3/2*x-5+2 = 0
X-3/2*x-3 = 0
X-3/2*x-3 = 0
X-3/2*x-3 = 0 // - X-3
-3/2*x = -(X-3) // : -3/2
x = (-(X-3))/(-3/2)
x = -2/3*(3-X)
x = -2/3*(3-X)
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