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y in (-oo:+oo)
(-4/9)*y = 23 // - 23
(-4/9)*y-23 = 0
-4/9*y-23 = 0 // + 23
-4/9*y = 23 // : -4/9
y = 23/(-4/9)
y = -207/4
y = -207/4
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