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y in (-oo:+oo)
(1/7)*(y-8)+(7/8)*y = y+1/8 // - y+1/8
(1/7)*(y-8)+(7/8)*y-y-(1/8) = 0
(1/7)*(y-8)+(7/8)*y-y-1/8 = 0
1/7*(y-8)+(7*y)/8-y-1/8 = 0
(1/7*8*(y-8))/8+(7*y)/8+(8*(-y))/8-1/8 = 0
1/7*8*(y-8)+7*y+8*(-y)-1 = 0
57/7*y-8*y-64/7-1 = 0
1/7*y-64/7-1 = 0
1/7*y-71/7 = 0
(1/7*y-71/7)/8 = 0
(1/7*y-71/7)/8 = 0 // * 8
1/7*y-71/7 = 0
1/7*y-71/7 = 0 // + 71/7
1/7*y = 71/7 // : 1/7
y = 71/7/1/7
y = 71
y = 71
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