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a in (-oo:+oo)
(1/3)*a+9/10 = 107/30 // - 107/30
(1/3)*a+9/10-(107/30) = 0
(1/3)*a+9/10-107/30 = 0
1/3*a-8/3 = 0 // + 8/3
1/3*a = 8/3 // : 1/3
a = 8/3/1/3
a = 8
a = 8
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