$x-10<30$
$m=x-2x^2-2xy$
$5ab-3a\cdot\frac{1}{2}b$
$-5^2+2\cdot8+8^2$
$\int\frac{x^3-3x^2+x-1}{x^2}dx$
$\left(3x^3+3x\right)^4$
$\frac{4x^3-17x^2+22x-21}{x^2-9}$
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