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y in (-oo:+oo)
20/15 = y/12 // - y/12
20/15-(y/12) = 0
4/3-1/12*y = 0 // - 4/3
-1/12*y = -4/3 // : -1/12
y = -4/3/(-1/12)
y = 16
y = 16
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