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x in (-oo:+oo)
(1/3)*x = 1000 // - 1000
(1/3)*x-1000 = 0
1/3*x-1000 = 0 // + 1000
1/3*x = 1000 // : 1/3
x = 1000/1/3
x = 3000
x = 3000
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