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x in (-oo:+oo)
(2/5)*x = 2000000 // - 2000000
(2/5)*x-2000000 = 0
2/5*x-2000000 = 0 // + 2000000
2/5*x = 2000000 // : 2/5
x = 2000000/2/5
x = 5000000
x = 5000000
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