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y in (-oo:+oo)
5/4 = y/12 // - y/12
5/4-(y/12) = 0
5/4-1/12*y = 0 // - 5/4
-1/12*y = -5/4 // : -1/12
y = -5/4/(-1/12)
y = 15
y = 15
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