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y in (-oo:+oo)
(1/7)*(y-8)+(7/8)*y = y+1/2 // - y+1/2
(1/7)*(y-8)+(7/8)*y-y-(1/2) = 0
(1/7)*(y-8)+(7/8)*y-y-1/2 = 0
1/7*(y-8)+(7*y)/8-y-1/2 = 0
(1/7*2*8*(y-8))/(2*8)+(2*7*y)/(2*8)+(2*8*(-y))/(2*8)+(-1*8)/(2*8) = 0
1/7*2*8*(y-8)+2*7*y+2*8*(-y)-1*8 = 0
114/7*y-16*y-128/7-8 = 0
2/7*y-128/7-8 = 0
2/7*y-184/7 = 0
(2/7*y-184/7)/(2*8) = 0
(2/7*y-184/7)/(2*8) = 0 // * 2*8
2/7*y-184/7 = 0
2/7*y-184/7 = 0 // + 184/7
2/7*y = 184/7 // : 2/7
y = 184/7/2/7
y = 92
y = 92
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