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x in (-oo:+oo)
40/750 = x/1000 // - x/1000
40/750-(x/1000) = 0
4/75-1/1000*x = 0 // - 4/75
-1/1000*x = -4/75 // : -1/1000
x = -4/75/(-1/1000)
x = 160/3
x = 160/3
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