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x in (-oo:+oo)
5460/390000 = x/660000 // - x/660000
5460/390000-(x/660000) = 0
7/500-1/660000*x = 0 // - 7/500
-1/660000*x = -7/500 // : -1/660000
x = -7/500/(-1/660000)
x = 9240
x = 9240
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