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y in (-oo:+oo)
-9/4 = (2/3)*y-(8/5) // - (2/3)*y-(8/5)
8/5-((2/3)*y)-9/4 = 0
(-2/3)*y-9/4+8/5 = 0
-2/3*y-13/20 = 0 // + 13/20
-2/3*y = 13/20 // : -2/3
y = 13/20/(-2/3)
y = -39/40
y = -39/40
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