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y in (-oo:+oo)
(1/6)*(y-7)+(6/7)*y = y+1/9 // - y+1/9
(1/6)*(y-7)+(6/7)*y-y-(1/9) = 0
(1/6)*(y-7)+(6/7)*y-y-1/9 = 0
1/6*(y-7)+(6*y)/7-y-1/9 = 0
(1/6*7*9*(y-7))/(7*9)+(6*9*y)/(7*9)+(7*9*(-y))/(7*9)+(-1*7)/(7*9) = 0
1/6*7*9*(y-7)+6*9*y+7*9*(-y)-1*7 = 0
129/2*y-63*y-147/2-7 = 0
3/2*y-147/2-7 = 0
3/2*y-161/2 = 0
(3/2*y-161/2)/(7*9) = 0
(3/2*y-161/2)/(7*9) = 0 // * 7*9
3/2*y-161/2 = 0
3/2*y-161/2 = 0 // + 161/2
3/2*y = 161/2 // : 3/2
y = 161/2/3/2
y = 161/3
y = 161/3
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