$7^3+x^2-7x^3-8x+12$
$-x^2-6x+7$
$8\cdot\frac{1}{4}$
$\int\left(3x^3-5\right)^5\cdot45x^2\cdot dx$
$\frac{t-2}{t-1}-\frac{3}{1-t}+\frac{t}{1-t}$
$8n-9+5n-9n-9$
$11r+12r-4r$
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