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x in (-oo:+oo)
X/5-(x/6) = 2/5 // - 2/5
X/5-(x/6)-(2/5) = 0
X/5-(x/6)-2/5 = 0
1/5*X-1/6*x-2/5 = 0 // - 1/5*X-2/5
-1/6*x = -(1/5*X-2/5) // : -1/6
x = (-(1/5*X-2/5))/(-1/6)
x = -6*(2/5-(1/5*X))
x = -6*(2/5-(1/5*X))
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