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