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x in (-oo:+oo)
x/40 = 0.4 // - 0.4
x/40-0.4 = 0
1/40*x-0.4 = 0 // + 0.4
1/40*x = 0.4 // : 1/40
x = 0.4/1/40
x = 16
x = 16
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