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y in (-oo:+oo)
(-4/9)*y = -1/2 // + -1/2
(-4/9)*y-(-1/2) = 0
(-4/9)*y+1/2 = 0
1/2-4/9*y = 0 // - 1/2
-4/9*y = -1/2 // : -4/9
y = -1/2/(-4/9)
y = 9/8
y = 9/8
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