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y in (-oo:+oo)
(1/8)*y-(18/2) = 7/8 // - 7/8
(1/8)*y-(18/2)-(7/8) = 0
(1/8)*y-7/8-9 = 0
1/8*y-79/8 = 0 // + 79/8
1/8*y = 79/8 // : 1/8
y = 79/8/1/8
y = 79
y = 79
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