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a in (-oo:+oo)
(3/4)*a-6 = 2/4 // - 2/4
(3/4)*a-(2/4)-6 = 0
(3/4)*a-1/2-6 = 0
3/4*a-13/2 = 0 // + 13/2
3/4*a = 13/2 // : 3/4
a = 13/2/3/4
a = 26/3
a = 26/3
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