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a in (-oo:+oo)
-3*a = -15/11 // + -15/11
-3*a-(-15/11) = 0
15/11-3*a = 0
15/11-3*a = 0 // - 15/11
-3*a = -15/11 // : -3
a = -15/11/(-3)
a = 5/11
a = 5/11
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