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y in (-oo:+oo)
(1/7)*(y-8)+(7/8)*y = y+11/8 // - y+11/8
(1/7)*(y-8)+(7/8)*y-y-(11/8) = 0
(1/7)*(y-8)+(7/8)*y-y-11/8 = 0
1/7*(y-8)+(7*y)/8-y-11/8 = 0
(1/7*8*(y-8))/8+(7*y)/8+(8*(-y))/8-11/8 = 0
1/7*8*(y-8)+7*y+8*(-y)-11 = 0
57/7*y-8*y-11-64/7 = 0
1/7*y-11-64/7 = 0
1/7*y-141/7 = 0
(1/7*y-141/7)/8 = 0
(1/7*y-141/7)/8 = 0 // * 8
1/7*y-141/7 = 0
1/7*y-141/7 = 0 // + 141/7
1/7*y = 141/7 // : 1/7
y = 141/7/1/7
y = 141
y = 141
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