$-5-2k-7k$
$-9x^2-8y+5y-2x-9$
$\frac{12x^2-7x}{\frac{3x}{2}+1}$
$40x^4y-40x^3y+10x^2y$
$2+\left(4-2\right)\cdot3$
$-14-6.\left[-\left(-4-7\right)\right]$
$a^2+\:3a^2\:+\:3a^2\:+1$
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