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a in (-oo:+oo)
(1/3)*a+9 = 19/3 // - 19/3
(1/3)*a-(19/3)+9 = 0
(1/3)*a-19/3+9 = 0
1/3*a+8/3 = 0 // - 8/3
1/3*a = -8/3 // : 1/3
a = -8/3/1/3
a = -8
a = -8
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