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a in (-oo:+oo)
(5*a)/6+(3*a)/4-(7/12) = (-2/1)/6 // - (-2/1)/6
(5*a)/6+(3*a)/4-(7/12)-((-2/1)/6) = 0
(5*a)/6+(3*a)/4-7/12+1/3 = 0
19/12*a-1/4 = 0 // + 1/4
19/12*a = 1/4 // : 19/12
a = 1/4/19/12
a = 3/19
a = 3/19
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