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x in (-oo:+oo)
(-8/9)*x = -16/27 // + -16/27
(-8/9)*x-(-16/27) = 0
(-8/9)*x+16/27 = 0
16/27-8/9*x = 0 // - 16/27
-8/9*x = -16/27 // : -8/9
x = -16/27/(-8/9)
x = 2/3
x = 2/3
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