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x in (-oo:+oo)
-3 = (x-500)/60 // - (x-500)/60
-((x-500)/60)-3 = 0
(-1*(x-500))/60-3 = 0
(-1*(x-500))/60+(-3*60)/60 = 0
-1*(x-500)-3*60 = 0
320-x = 0
(320-x)/60 = 0
(320-x)/60 = 0 // * 60
320-x = 0
320-x = 0 // - 320
-x = -320 // * -1
x = 320
x = 320
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