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y in (-oo:+oo)
7/13 = 4*y // - 4*y
7/13-(4*y) = 0
7/13-4*y = 0
7/13-4*y = 0 // - 7/13
-4*y = -7/13 // : -4
y = -7/13/(-4)
y = 7/52
y = 7/52
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