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a in (-oo:+oo)
(1/2)*a = -5/12 // + -5/12
(1/2)*a-(-5/12) = 0
(1/2)*a+5/12 = 0
1/2*a+5/12 = 0 // - 5/12
1/2*a = -5/12 // : 1/2
a = -5/12/1/2
a = -5/6
a = -5/6
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