$21:\left(-7\right)+10\cdot\left(-2\right)+9\cdot4-15\cdot3$
$2x^2+32x+128$
$100x^2-60x-30$
$38-\left(-17\right)$
$\left[\left(+80\right)\::\:\left(-8\right)\right]\::\:\left(-5\right)$
$-9x+2x-x-8x$
$\lim_{x\to0}\left(\left(4x\right)^{2\sin\left(x\right)}\right)$
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