$6b+4b$
$\frac{7^5-k^5}{7+k}$
$3x-6>33$
$\left(\frac{12a^{3}b^{2}}{-6a^{2}b^{2}}\right)^{3}$
$\left(x^{2-x-6}\right)$
$-3x^5-8x^3+9x^5-6x+10x^3-5x+1$
$-16\cdot4$
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