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y in (-oo:+oo)
y/8-(y/12) = 7/8 // - 7/8
y/8-(y/12)-(7/8) = 0
y/8-(y/12)-7/8 = 0
1/24*y-7/8 = 0 // + 7/8
1/24*y = 7/8 // : 1/24
y = 7/8/1/24
y = 21
y = 21
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