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y in (-oo:+oo)
8/13 = y/4 // - y/4
8/13-(y/4) = 0
8/13-1/4*y = 0 // - 8/13
-1/4*y = -8/13 // : -1/4
y = -8/13/(-1/4)
y = 32/13
y = 32/13
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