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x in (-oo:+oo)
1-(2*X)-(1/6) = (3*x)/8 // - (3*x)/8
1-(2*X)-((3*x)/8)-(1/6) = 0
(-3/8)*x-2*X-1/6+1 = 0
5/6-2*X-3/8*x = 0 // - 5/6-2*X
-3/8*x = -(5/6-2*X) // : -3/8
x = (-(5/6-2*X))/(-3/8)
x = 8/3*(5/6-2*X)
x = 8/3*(5/6-2*X)
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