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y in (-oo:+oo)
(-2*y)/13 = 8/13 // - 8/13
(-2*y)/13-(8/13) = 0
(-2*y)/13-8/13 = 0
-2/13*y-8/13 = 0 // + 8/13
-2/13*y = 8/13 // : -2/13
y = 8/13/(-2/13)
y = -4
y = -4
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