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x in (-oo:+oo)
100000000*x-(1000000/(-10000)) = 0
100000000*x+100 = 0
100000000*x+100 = 0 // - 100
100000000*x = -100 // : 100000000
x = -100/100000000
x = -1/1000000
x = -1/1000000
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