$6-9z$
$\frac{3x^2+3x-18}{x+3}$
$3x^4+3x^3-18x^2$
$5+4\cdot4$
$147\cdot6$
$\int_0^2x\left(\frac{1}{2}x^2+2\right)-\left(x^2\right)dx$
$x^2+20x-86$
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