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x in (-oo:+oo)
(5/3)*x+1500 = x // - x
(5/3)*x-x+1500 = 0
2/3*x+1500 = 0 // - 1500
2/3*x = -1500 // : 2/3
x = -1500/2/3
x = -2250
x = -2250
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