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a in (-oo:+oo)
(15*a)/2 = -5/12 // + -5/12
(15*a)/2-(-5/12) = 0
(15*a)/2+5/12 = 0
15/2*a+5/12 = 0 // - 5/12
15/2*a = -5/12 // : 15/2
a = -5/12/15/2
a = -1/18
a = -1/18
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