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x in (-oo:+oo)
20/150 = x/12000 // - x/12000
20/150-(x/12000) = 0
2/15-1/12000*x = 0 // - 2/15
-1/12000*x = -2/15 // : -1/12000
x = -2/15/(-1/12000)
x = 1600
x = 1600
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