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a in (-oo:+oo)
(3*a)/7 = 2*a-6 // - 2*a-6
(3*a)/7-(2*a)+6 = 0
(3*a)/7-2*a+6 = 0
6-11/7*a = 0 // - 6
-11/7*a = -6 // : -11/7
a = -6/(-11/7)
a = 42/11
a = 42/11
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