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a in (-oo:+oo)
(2*a)/7 = 2/3 // - 2/3
(2*a)/7-(2/3) = 0
(2*a)/7-2/3 = 0
2/7*a-2/3 = 0 // + 2/3
2/7*a = 2/3 // : 2/7
a = 2/3/2/7
a = 7/3
a = 7/3
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