$4x^2b+2xb^2$
$\frac{-12x^3+9x^2+20x-15}{4x-3}$
$-5x^2+3x+2$
$\left(3+2i\right)^2+3i^{15}\left(3-2i^2\right)$
$10a+1+0$
$\left(\frac{5}{4}.-\frac{1}{3}\right)^2$
$-24.37+5.308$
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