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y in (-oo:+oo)
(-1/9)*(y+1/8) = (-1/2)*(y-(2/3)) // - (-1/2)*(y-(2/3))
(-1/9)*(y+1/8)-((-1/2)*(y-(2/3))) = 0
(-1/9)*(y+1/8)+(1/2)*(y-2/3) = 0
1/2*(y-2/3)-1/9*(y+1/8) = 0
1/2*(y-2/3)-1/9*(y+1/8) = 0
7/18*y-25/72 = 0
7/18*y-25/72 = 0
7/18*y-25/72 = 0 // + 25/72
7/18*y = 25/72 // : 7/18
y = 25/72/7/18
y = 25/28
y = 25/28
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