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x in (-oo:+oo)
x/0.02 = 3.1*10^4 // - 3.1*10^4
x/0.02-(3.1*10^4) = 0
x/0.02-3.1*10^4 = 0
50*x-31000 = 0 // + 31000
50*x = 31000 // : 50
x = 31000/50
x = 620
x = 620
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