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x in (-oo:+oo)
-6*x-(2/3) = 5/6 // - 5/6
-6*x-(2/3)-(5/6) = 0
-6*x-2/3-5/6 = 0
-6*x-3/2 = 0 // + 3/2
-6*x = 3/2 // : -6
x = 3/2/(-6)
x = -1/4
x = -1/4
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