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