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x in (-oo:+oo)
1 = (x-30)/30 // - (x-30)/30
1-((x-30)/30) = 0
(-1*(x-30))/30+1 = 0
(-1*(x-30))/30+(1*30)/30 = 0
1*30-1*(x-30) = 0
60-x = 0
(60-x)/30 = 0
(60-x)/30 = 0 // * 30
60-x = 0
60-x = 0 // - 60
-x = -60 // * -1
x = 60
x = 60
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