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x in (-oo:+oo)
12-((5*x)/6) = 13 // - 13
12-((5*x)/6)-13 = 0
(-5/6)*x-13+12 = 0
-5/6*x-1 = 0 // + 1
-5/6*x = 1 // : -5/6
x = 1/(-5/6)
x = -6/5
x = -6/5
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