$- 3 a ^ { 2 } + 6 a ^ { 2 }$
$\lim_{x\to0}\left(\frac{\tan\left(x\right)}{x}\right)\left(1\right)$
$6x^2=5x\:-1$
$\left(x^2-5x\right)-\left(-x^2+6\right)$
$-6a^8+10a^4c+3a^4c-5c^2$
$x^4-100x^3+x^5-100x^2$
$\left(5x+5\right)^3$
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