$2x+5x^2=0$
$-a^2+3ab+b;\:a=3;\:b=-2$
$18\sin\left(x\right)=\frac{36}{\pi}+9sin\left(2x\right)$
$16a^2-121$
$144+128+72$
$\left(d-a\right)^2\left(d+a\right)^2$
$\frac{x^{3+1}}{x^2-9}$
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