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a in (-oo:+oo)
(1.4-(2*a)+5.6)/12 = 4.5 // - 4.5
(1.4-(2*a)+5.6)/12-4.5 = 0
(1.4-2*a+5.6)/12-4.5 = 0
(7-2*a)/12-4.5 = 0
(7-2*a)/12+(-4.5*12)/12 = 0
7-2*a-4.5*12 = 0
-2*a-47 = 0
(-2*a-47)/12 = 0
(-2*a-47)/12 = 0 // * 12
-2*a-47 = 0
-2*a-47 = 0 // + 47
-2*a = 47 // : -2
a = 47/(-2)
a = -47/2
a = -47/2
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