$1,200+2,00$
$-10+\left|\sqrt{16}-3\left(5-10\right)-9\right|$
$2a^2+a$
$\frac{x^2-4}{x+4}$
$x^7-2x^6-6x^5+20x^4-19x^3+6x^2=0$
$\left(7b-3\right)^2$
$12\cos\left(x\right)^2+6\cos\left(x\right)=0$
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