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a in (-oo:+oo)
(2*a)/3 = 5*a-91 // - 5*a-91
(2*a)/3-(5*a)+91 = 0
(2*a)/3-5*a+91 = 0
91-13/3*a = 0 // - 91
-13/3*a = -91 // : -13/3
a = -91/(-13/3)
a = 21
a = 21
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