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