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a in (-oo:+oo)
(8/3)*a = -2/15 // + -2/15
(8/3)*a-(-2/15) = 0
(8/3)*a+2/15 = 0
8/3*a+2/15 = 0 // - 2/15
8/3*a = -2/15 // : 8/3
a = -2/15/8/3
a = -1/20
a = -1/20
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