$7x+2+3-7x$
$12x^2-27$
$49c^2+56c+16$
$\frac{dy}{dx}=-2xe^{y-x}$
$3x\left(x-1\right)-2y\left(x-1\right)+4\left(x-1\right)$
$\frac{3yx^{13}}{15y^4}$
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