$15a+25b$
$\frac{5s+5}{\left(5s+10\right)s}$
$\lim_{x\to\infty}\left(\frac{3x^3-4x^2-3x+7}{6x^2-x-8}\right)$
$169b^{\left(4\right)}+200b^{\left(2\right)}+144+114a^{\left(2\right)}b^{\left(2\right)}-114a^{\left(2\right)}b^{\left(2\right)}$
$4x^2-7x+7$
$9x<8$
$13a-2b+5c-4+7a+b+5c-7+7a-18b+4c+3$
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