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x in (-oo:+oo)
-1 = (x-65)/5 // - (x-65)/5
-((x-65)/5)-1 = 0
(-1*(x-65))/5-1 = 0
(-1*(x-65))/5+(-1*5)/5 = 0
-1*(x-65)-1*5 = 0
60-x = 0
(60-x)/5 = 0
(60-x)/5 = 0 // * 5
60-x = 0
60-x = 0 // - 60
-x = -60 // * -1
x = 60
x = 60
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