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y in (-oo:+oo)
(1/6)*(y+2) = (-1/8)*(y+1/9) // - (-1/8)*(y+1/9)
(1/6)*(y+2)-((-1/8)*(y+1/9)) = 0
(1/6)*(y+2)+(1/8)*(y+1/9) = 0
1/6*(y+2)+1/8*(y+1/9) = 0
1/6*(y+2)+1/8*(y+1/9) = 0
7/24*y+25/72 = 0
7/24*y+25/72 = 0
7/24*y+25/72 = 0 // - 25/72
7/24*y = -25/72 // : 7/24
y = -25/72/7/24
y = -25/21
y = -25/21
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