$x^2+21x+90$
$15x^2+3x+2=0$
$0-\left(35-\left(-53\right)\right)$
$\frac{6.9}{3}$
$\frac{25-\left(a+1\right)^2}{5+\left(a+1\right)^2}$
$2t\left(-x^2+5xy^4-2xy+y^5\right)$
$13x^2z+2x^2z-x^2z-20x^2z$
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