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x in (-oo:+oo)
(x+y)/5000 = 0.15 // - 0.15
(x+y)/5000-0.15 = 0
(x+y)/5000+(-0.15*5000)/5000 = 0
x+y-0.15*5000 = 0
x+y-750 = 0
(x+y-750)/5000 = 0
(x+y-750)/5000 = 0 // * 5000
x+y-750 = 0
x+y-750 = 0 // - y-750
x = -(y-750)
x = 750-y
x = 750-y
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