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x in (-oo:+oo)
X-(2/5) = x/7.5 // - x/7.5
X-(x/7.5)-(2/5) = 0
X-0.13333333*x-2/5 = 0
X-0.13333333*x-2/5 = 0 // - X-2/5
-0.13333333*x = -(X-2/5) // : -0.13333333
x = (-(X-2/5))/(-0.13333333)
x = -7.50000019*(2/5-X)
x = -7.50000019*(2/5-X)
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