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a in (-oo:+oo)
(3/4)*a+1 = 23/14 // - 23/14
(3/4)*a-(23/14)+1 = 0
(3/4)*a-23/14+1 = 0
3/4*a-9/14 = 0 // + 9/14
3/4*a = 9/14 // : 3/4
a = 9/14/3/4
a = 6/7
a = 6/7
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