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x in (-oo:+oo)
X-((7*x)/8) = 7/8 // - 7/8
X-((7*x)/8)-(7/8) = 0
X+(-7/8)*x-7/8 = 0
X-7/8*x-7/8 = 0 // - X-7/8
-7/8*x = -(X-7/8) // : -7/8
x = (-(X-7/8))/(-7/8)
x = -8/7*(7/8-X)
x = -8/7*(7/8-X)
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