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a in (-oo:+oo)
(5*a)/6+(3*a)/4-(7/12) = 6-21 // - 6-21
(5*a)/6+(3*a)/4-(7/12)-6+21 = 0
(5*a)/6+(3*a)/4-7/12-6+21 = 0
19/12*a+173/12 = 0 // - 173/12
19/12*a = -173/12 // : 19/12
a = -173/12/19/12
a = -173/19
a = -173/19
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