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a in (-oo:+oo)
2/3-((3/4)*a) = 13/24 // - 13/24
2/3-((3/4)*a)-(13/24) = 0
(-3/4)*a+2/3-13/24 = 0
1/8-3/4*a = 0 // - 1/8
-3/4*a = -1/8 // : -3/4
a = -1/8/(-3/4)
a = 1/6
a = 1/6
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