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x in (-oo:+oo)
X-(2/5) = 4*x+2/25 // - 4*x+2/25
X-(4*x)-(2/5)-(2/25) = 0
X-4*x-2/5-2/25 = 0
X-4*x-12/25 = 0 // - X-12/25
-4*x = -(X-12/25) // : -4
x = (-(X-12/25))/(-4)
x = (12/25-X)/(-4)
x = (12/25-X)/(-4)
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