$\left(-10x^2-4x^2+5x-1\right)-\left(x^3-4x^2+x-1\right)$
$-x^4+3x^2-7x$
$\frac{da}{dt}=1.321-0.01a$
$\frac{1}{2}mc^2-\frac{7}{2}mc^2+4mc^2$
$2x^3+12x+16$
$6x^2\cdot3^3+18x$
$\left(5xy^4+3x^2y^2\right)\left(-5xy^4-3x^2y^2\right)$
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