$2c^2+9c+7$
$a+b-\left(-a+b\right)+\left(b-a\right)-b$
$5\log\left(y\right)+2\log\left(x\right)$
$-2x^2-2x+4$
$4x^2+x=3$
$\frac{x^61}{x-1}$
$5.6\cdot1000$
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