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y in (-oo:+oo)
(-5/9)*y = -1 // + 1
(-5/9)*y+1 = 0
1-5/9*y = 0 // - 1
-5/9*y = -1 // : -5/9
y = -1/(-5/9)
y = 9/5
y = 9/5
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