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