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x in (-oo:+oo)
7/15 = x/1000000 // - x/1000000
7/15-(x/1000000) = 0
7/15-1/1000000*x = 0 // - 7/15
-1/1000000*x = -7/15 // : -1/1000000
x = -7/15/(-1/1000000)
x = 1400000/3
x = 1400000/3
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