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x in (-oo:+oo)
(1600/12)*x = 1000 // - 1000
(1600/12)*x-1000 = 0
400/3*x-1000 = 0 // + 1000
400/3*x = 1000 // : 400/3
x = 1000/400/3
x = 15/2
x = 15/2
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