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x in (-oo:+oo)
60 = x/450000 // - x/450000
60-(x/450000) = 0
60-1/450000*x = 0 // - 60
-1/450000*x = -60 // : -1/450000
x = -60/(-1/450000)
x = 27000000
x = 27000000
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