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a in (-oo:+oo)
(3/2)*a-((3/1)*(4*a+1)) = -2 // + 2
(3/2)*a-((3/1)*(4*a+1))+2 = 0
(3/2)*a-3*(4*a+1)+2 = 0
(3*a)/2-3*(4*a+1)+2 = 0
(-3*2*(4*a+1))/2+(3*a)/2+(2^2)/2 = 0
3*a-3*2*(4*a+1)+4 = 0
4-21*a-6 = 0
-21*a-2 = 0
(-21*a-2)/2 = 0
(-21*a-2)/2 = 0 // * 2
-21*a-2 = 0
-21*a-2 = 0 // + 2
-21*a = 2 // : -21
a = 2/(-21)
a = -2/21
a = -2/21
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