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x in (-oo:+oo)
-6*x = -12/13 // + -12/13
-6*x-(-12/13) = 0
12/13-6*x = 0
12/13-6*x = 0 // - 12/13
-6*x = -12/13 // : -6
x = -12/13/(-6)
x = 2/13
x = 2/13
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