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a in (-oo:+oo)
(5*a)/12-((3*a)/4) = 7/6 // - 7/6
(5*a)/12-((3*a)/4)-(7/6) = 0
(5*a)/12+(-3/4)*a-7/6 = 0
-1/3*a-7/6 = 0 // + 7/6
-1/3*a = 7/6 // : -1/3
a = 7/6/(-1/3)
a = -7/2
a = -7/2
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