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a in (-oo:+oo)
(2/3)*a-(3/4) = 34 // - 34
(2/3)*a-(3/4)-34 = 0
(2/3)*a-3/4-34 = 0
2/3*a-139/4 = 0 // + 139/4
2/3*a = 139/4 // : 2/3
a = 139/4/2/3
a = 417/8
a = 417/8
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