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z in (-oo:+oo)
(-4/9)*z = -27/12 // + -27/12
(-4/9)*z-(-27/12) = 0
(-4/9)*z+9/4 = 0
9/4-4/9*z = 0 // - 9/4
-4/9*z = -9/4 // : -4/9
z = -9/4/(-4/9)
z = 81/16
z = 81/16
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