$1200+\int_2^7r\left(t\right)dt$
$\left(x+9\right)\cdot5$
$-2x+3\le-9-3x$
$\left(5a+2b-c\right)-\left(12a-6b+9c\right)$
$\sqrt{x^2+1}dy+x\left(y-1\right)dx=0$
$2\cdot\frac{x}{2}$
$3x+2x-x+2x^2$
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