$4a^2b^2+-6a^2b^2$
$\left(5x^2+x\right)\left(5x^2-x\right)$
$\lim_{x\to-1}\left(x^3+3x^2-x+1\right)$
$x+2\cdot4$
$10a+7a-8a+15+3$
$\left(a-c\right)^5$
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