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y in (-oo:+oo)
(-2/3)*y = -1/9 // + -1/9
(-2/3)*y-(-1/9) = 0
(-2/3)*y+1/9 = 0
1/9-2/3*y = 0 // - 1/9
-2/3*y = -1/9 // : -2/3
y = -1/9/(-2/3)
y = 1/6
y = 1/6
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