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a in (-oo:+oo)
(4*a)/9 = -14/81 // + -14/81
(4*a)/9-(-14/81) = 0
(4*a)/9+14/81 = 0
4/9*a+14/81 = 0 // - 14/81
4/9*a = -14/81 // : 4/9
a = -14/81/4/9
a = -7/18
a = -7/18
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