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x in (-oo:+oo)
x/50 = 0.4/125 // - 0.4/125
x/50-(0.4/125) = 0
x/50-0.0032 = 0
1/50*x-0.0032 = 0 // + 0.0032
1/50*x = 0.0032 // : 1/50
x = 0.0032/1/50
x = 0.16
x = 0.16
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