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