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a in (-oo:+oo)
(3*a)/4+a/3 = 13/3 // - 13/3
(3*a)/4+a/3-(13/3) = 0
(3*a)/4+a/3-13/3 = 0
13/12*a-13/3 = 0 // + 13/3
13/12*a = 13/3 // : 13/12
a = 13/3/13/12
a = 4
a = 4
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