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X-((7/2)*x)-1 = 0
X+(-7/2)*x-1 = 0
X-7/2*x-1 = 0 // - X-1
-7/2*x = -(X-1) // : -7/2
x = (-(X-1))/(-7/2)
x = -2/7*(1-X)
x = -2/7*(1-X)
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