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y in (-oo:+oo)
y/12-(y/8) = 7/12 // - 7/12
y/12-(y/8)-(7/12) = 0
y/12-(y/8)-7/12 = 0
-1/24*y-7/12 = 0 // + 7/12
-1/24*y = 7/12 // : -1/24
y = 7/12/(-1/24)
y = -14
y = -14
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