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y in (-oo:+oo)
(17-y)/3 = 4.5 // - 4.5
(17-y)/3-4.5 = 0
(17-y)/3+(-4.5*3)/3 = 0
17-y-4.5*3 = 0
3.5-y = 0
(3.5-y)/3 = 0
(3.5-y)/3 = 0 // * 3
3.5-y = 0
3.5-y = 0 // - 3.5
-y = -3.5 // * -1
y = 3.5
y = 3.5
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