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