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x in (-oo:+oo)
(7/10)*x+45000 = x // - x
(7/10)*x-x+45000 = 0
45000-3/10*x = 0 // - 45000
-3/10*x = -45000 // : -3/10
x = -45000/(-3/10)
x = 150000
x = 150000
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