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x in (-oo:+oo)
(2/3)*x = 7000 // - 7000
(2/3)*x-7000 = 0
2/3*x-7000 = 0 // + 7000
2/3*x = 7000 // : 2/3
x = 7000/2/3
x = 10500
x = 10500
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