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x in (-oo:+oo)
((3*x)/4)*(2*x+1) = x/3+(6*x)/9 // - x/3+(6*x)/9
((3*x)/4)*(2*x+1)-(x/3)-((6*x)/9) = 0
((3*x)/4)*(2*x+1)-(x/3)+(-2/3)*x = 0
3/4*x*(2*x+1)-x/3+(-2*x)/3 = 0
(3/4*3*x*(2*x+1))/3-x/3+(-2*x)/3 = 0
3/4*3*x*(2*x+1)-x-2*x = 0
9/2*x^2+5/4*x-2*x = 0
9/2*x^2-3/4*x = 0
9/2*x^2-3/4*x = 0
3/2*x*(3*x-1/2) = 0
3*x-1/2 = 0 // + 1/2
3*x = 1/2 // : 3
x = 1/2/3
x = 1/6
3/2*x*(x-1/6) = 0
(3/2*x*(x-1/6))/3 = 0
(3/2*x*(x-1/6))/3 = 0 // * 3
3/2*x*(x-1/6) = 0
( 3/2*x )
3/2*x = 0 // : 3/2
x = 0
( x-1/6 )
x-1/6 = 0 // + 1/6
x = 1/6
x in { 0, 1/6 }
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