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a in (-oo:+oo)
(5*a)/6+(3*a)/4-(7/12) = -2.2 // + 2.2
(5*a)/6+(3*a)/4-(7/12)+2.2 = 0
(5*a)/6+(3*a)/4-7/12+2.2 = 0
19/12*a+1.61666667 = 0 // - 1.61666667
19/12*a = -1.61666667 // : 19/12
a = -1.61666667/19/12
a = -1.02105264
a = -1.02105264
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