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x in (-oo:+oo)
20 = (x-89)/13 // - (x-89)/13
20-((x-89)/13) = 0
(-1*(x-89))/13+20 = 0
(-1*(x-89))/13+(13*20)/13 = 0
13*20-1*(x-89) = 0
349-x = 0
(349-x)/13 = 0
(349-x)/13 = 0 // * 13
349-x = 0
349-x = 0 // - 349
-x = -349 // * -1
x = 349
x = 349
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