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a in (-oo:+oo)
(3/4)*a+(2/3)*a = 34 // - 34
(3/4)*a+(2/3)*a-34 = 0
17/12*a-34 = 0 // + 34
17/12*a = 34 // : 17/12
a = 34/17/12
a = 24
a = 24
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