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