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y in (-oo:+oo)
(1/2)*y-(4/7) = 17*y-(9/2) // - 17*y-(9/2)
(1/2)*y-(17*y)-(4/7)+9/2 = 0
(1/2)*y-17*y-4/7+9/2 = 0
55/14-33/2*y = 0 // - 55/14
-33/2*y = -55/14 // : -33/2
y = -55/14/(-33/2)
y = 5/21
y = 5/21
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