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y in (-oo:+oo)
y = (3*y+9)/600 // - (3*y+9)/600
y-((3*y+9)/600) = 0
(-1*(3*y+9))/600+y = 0
(-1*(3*y+9))/600+(600*y)/600 = 0
600*y-1*(3*y+9) = 0
597*y-9 = 0
(597*y-9)/600 = 0
(597*y-9)/600 = 0 // * 600
597*y-9 = 0
597*y-9 = 0 // + 9
597*y = 9 // : 597
y = 9/597
y = 3/199
y = 3/199
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