$-7a\sqrt{b}+9\sqrt{ab}$
$\left(2a+1\right)\left(1+2b\right)$
$4y-1^2$
$9\cdot8+1+5\cdot7$
$\lim_{x\to4}\left(\frac{x^2-16}{3x^3+x-24}\right)$
$3\left(x-y\right)^2+2y\left(x-y\right)-5y^2$
$58.263-26.974$
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