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x in (-oo:+oo)
-13*x = 1/6 // - 1/6
-13*x-(1/6) = 0
-13*x-1/6 = 0
-13*x-1/6 = 0 // + 1/6
-13*x = 1/6 // : -13
x = 1/6/(-13)
x = -1/78
x = -1/78
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