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a in (-oo:+oo)
(1/2)*a-(1/3) = -2 // + 2
(1/2)*a-(1/3)+2 = 0
(1/2)*a-1/3+2 = 0
1/2*a+5/3 = 0 // - 5/3
1/2*a = -5/3 // : 1/2
a = -5/3/1/2
a = -10/3
a = -10/3
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