$5\left(x+2\right)+3+4x$
$10+12k-17-5k$
$-5x^2+15xy$
$x^2+10x-13$
$+12.5-10.9$
$4x^2-12x+9+5$
$\frac{x^3+6x^3-12x-9}{x+3}$
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