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y in (-oo:+oo)
-y-66/15 = -4/5 // + -4/5
-y-66/15-(-4/5) = 0
4/5-y-66/15 = 0
-y-18/5 = 0 // + 18/5
-y = 18/5 // * -1
y = -18/5
y = -18/5
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