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x in (-oo:+oo)
(4*x*(4*x+1))/2+4*(3*x+1) = (3*x+2)^2 // - (3*x+2)^2
(4*x*(4*x+1))/2+4*(3*x+1)-(3*x+2)^2 = 0
(4*x*(4*x+1))/2+4*(3*x+1)-1*(3*x+2)^2 = 0
(4*x*(4*x+1))/2+(2*4*(3*x+1))/2+(-1*2*(3*x+2)^2)/2 = 0
4*x*(4*x+1)+2*4*(3*x+1)-1*2*(3*x+2)^2 = 0
16*x^2-18*x^2+28*x-24*x-8+8 = 0
4*x-2*x^2 = 0
4*x-2*x^2 = 0
2*x*(2-x) = 0
2-x = 0 // - 2
-x = -2 // * -1
x = 2
2*x*(x-2) = 0
(2*x*(x-2))/2 = 0
(2*x*(x-2))/2 = 0 // * 2
2*x*(x-2) = 0
( 2*x )
2*x = 0 // : 2
x = 0
( x-2 )
x-2 = 0 // + 2
x = 2
x in { 0, 2 }
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