$-4.2+3-3.14\cdot2.25$
$\frac{2}{x-2}+\frac{1}{x+2}-3=0$
$x-8x$
$676-\left(-240\right)$
$\int\frac{1}{x^4-9}dx$
$2a^2-\frac{5}{3}a+a-3a^2-6a^2$
$3+3a+10a$
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