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x in (-oo:+oo)
(-4/9)*x = 16/27 // - 16/27
(-4/9)*x-(16/27) = 0
(-4/9)*x-16/27 = 0
-4/9*x-16/27 = 0 // + 16/27
-4/9*x = 16/27 // : -4/9
x = 16/27/(-4/9)
x = -4/3
x = -4/3
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