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x in (-oo:+oo)
400 = (12*x)/1000 // - (12*x)/1000
400-((12*x)/1000) = 0
(-3/250)*x+400 = 0
400-3/250*x = 0 // - 400
-3/250*x = -400 // : -3/250
x = -400/(-3/250)
x = 100000/3
x = 100000/3
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