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y in (-oo:+oo)
(-8/9)*(y+9) = 64 // - 64
(-8/9)*(y+9)-64 = 0
-8/9*(y+9)-64 = 0
-8/9*(y+9)-64 = 0
-8/9*y-72 = 0
-8/9*y-72 = 0
-8/9*y-72 = 0 // + 72
-8/9*y = 72 // : -8/9
y = 72/(-8/9)
y = -81
y = -81
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