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y in (-oo:+oo)
-21/2 = 9-(2*y) // - 9-(2*y)
2*y-21/2-9 = 0
2*y-39/2 = 0 // + 39/2
2*y = 39/2 // : 2
y = 39/2/2
y = 39/4
y = 39/4
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