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y in (-oo:+oo)
(2*y-9)/20 = 1 // - 1
(2*y-9)/20-1 = 0
(2*y-9)/20+(-1*20)/20 = 0
2*y-1*20-9 = 0
2*y-29 = 0
(2*y-29)/20 = 0
(2*y-29)/20 = 0 // * 20
2*y-29 = 0
2*y-29 = 0 // + 29
2*y = 29 // : 2
y = 29/2
y = 29/2
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