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x in (-oo:+oo)
X/8 = x/5 // - x/5
X/8-(x/5) = 0
1/8*X-1/5*x = 0 // - 1/8*X
-1/5*x = -(1/8*X) // : -1/5
x = (-(1/8*X))/(-1/5)
x = 5/8*X
x = 5/8*X
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