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y in (-oo:+oo)
13/26 = y/78 // - y/78
13/26-(y/78) = 0
1/2-1/78*y = 0 // - 1/2
-1/78*y = -1/2 // : -1/78
y = -1/2/(-1/78)
y = 39
y = 39
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