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a in (-oo:+oo)
(5*a)/6+(3*a)/4-(7/12) = 1/6-2 // - 1/6-2
(5*a)/6+(3*a)/4-(7/12)-(1/6)+2 = 0
(5*a)/6+(3*a)/4-7/12-1/6+2 = 0
19/12*a+5/4 = 0 // - 5/4
19/12*a = -5/4 // : 19/12
a = -5/4/19/12
a = -15/19
a = -15/19
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