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a in (-oo:+oo)
11/30 = -a/9 // + -a/9
11/30-(-a/9) = 0
(1/9)*a+11/30 = 0
1/9*a+11/30 = 0 // - 11/30
1/9*a = -11/30 // : 1/9
a = -11/30/1/9
a = -33/10
a = -33/10
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