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y in (-oo:+oo)
16 = 9*y+4*y+7/7+2/5 // - 9*y+4*y+7/7+2/5
16-(9*y)-(4*y)-(7/7)-(2/5) = 0
16-9*y-4*y-2/5-1 = 0
73/5-13*y = 0 // - 73/5
-13*y = -73/5 // : -13
y = -73/5/(-13)
y = 73/65
y = 73/65
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