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y in (-oo:+oo)
(2-y)/3 = 30 // - 30
(2-y)/3-30 = 0
(2-y)/3+(-30*3)/3 = 0
2-y-30*3 = 0
-y-88 = 0
(-y-88)/3 = 0
(-y-88)/3 = 0 // * 3
-y-88 = 0
-y-88 = 0 // + 88
-y = 88 // * -1
y = -88
y = -88
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