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x in (-oo:+oo)
X-(2/3) = (5*x)/12 // - (5*x)/12
X-((5*x)/12)-(2/3) = 0
X+(-5/12)*x-2/3 = 0
X-5/12*x-2/3 = 0 // - X-2/3
-5/12*x = -(X-2/3) // : -5/12
x = (-(X-2/3))/(-5/12)
x = -12/5*(2/3-X)
x = -12/5*(2/3-X)
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