$-2a-a$
$\left(\frac{1}{2}m^2+5n^3\right)\cdot\left(\frac{1}{2}m^2-5n^3\right)$
$a^2\:-\:3b;\:a=-2;\:b=-1$
$6-1^4+2^3-3^2+1$
$abc\left(a-4\right)\left(b-3\right)\left(d-7\right)$
$29.8-10.1$
$4-4\cdot2+4$
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