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a in (-oo:+oo)
(5*a)/6+(3*a)/4-(7/12) = -2.166 // + 2.166
(5*a)/6+(3*a)/4-(7/12)+2.166 = 0
(5*a)/6+(3*a)/4-7/12+2.166 = 0
19/12*a+1.58266667 = 0 // - 1.58266667
19/12*a = -1.58266667 // : 19/12
a = -1.58266667/19/12
a = -0.99957895
a = -0.99957895
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