$\left(2a^2+7y\right)\left(2a^2-8y^2\right)$
$\left(-22\right)-\left[\left(-23\right)+\left(+15\right)+\left(-13\right)\right]+\left(-17\right)$
$3x^3+4x^2-7x+1+4x^3-5x^2+3$
$3x^2-7x-6=0$
$-2b-6+3b-2$
$20f+10=-170$
$\lim_{x\to0}\left(\frac{1+x-\left(1+x\right)^3}{x}\right)$
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