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a in (-oo:+oo)
(1/3)*a+1/6 = -23/6 // + -23/6
(1/3)*a+1/6-(-23/6) = 0
(1/3)*a+1/6+23/6 = 0
1/3*a+4 = 0 // - 4
1/3*a = -4 // : 1/3
a = -4/1/3
a = -12
a = -12
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