$-55\cdot464$
$12x-5x+8x-10x$
$\left(3x^{1-2a}\right)^3$
$\frac{x^3-4}{2x-4^2}$
$0.25k-k$
$-\frac{x^7y^6}{-8x^9y^{10}}$
$6x^2+12xy$
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