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y in (-oo:+oo)
(-5/9)*y-y+7/9 = (1/81)*(y-2) // - (1/81)*(y-2)
(-5/9)*y-((1/81)*(y-2))-y+7/9 = 0
(-1/81)*(y-2)+(-5/9)*y-y+7/9 = 0
(-5*y)/9-1/81*(y-2)-y+7/9 = 0
(-1/81*9*(y-2))/9+(-5*y)/9+(9*(-y))/9+7/9 = 0
9*(-y)-1/81*9*(y-2)-5*y+7 = 0
2/9-46/9*y-9*y+7 = 0
2/9-127/9*y+7 = 0
65/9-127/9*y = 0
(65/9-127/9*y)/9 = 0
(65/9-127/9*y)/9 = 0 // * 9
65/9-127/9*y = 0
65/9-127/9*y = 0 // - 65/9
-127/9*y = -65/9 // : -127/9
y = -65/9/(-127/9)
y = 65/127
y = 65/127
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