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a in (-oo:+oo)
(20*a)/30+6/30 = 35/30 // - 35/30
(20*a)/30+6/30-(35/30) = 0
(20*a)/30+6/30-7/6 = 0
2/3*a-29/30 = 0 // + 29/30
2/3*a = 29/30 // : 2/3
a = 29/30/2/3
a = 29/20
a = 29/20
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