$-7-3b-5b+4$
$2\left(x+y\right)+5\left(x^2+xy\right)$
$\left(\left(\sqrt[3]{x}\right)^4\right)^2$
$\lim_{x\to0}-3\left(\frac{1}{x}-cotx\right)$
$20+2x\ge5x$
$5-y=15$
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