$\left(\frac{\left(3r-1\right)^2+\left(x+3\right)^2-10}{10x^2}\right)$
$3x\:+\:4x\:+\:5y\:+\:6y\:+\:7\:+\:8$
$\left(x^4+x^2+2x+2\right)\:x+1$
$\int\frac{2x-9}{x^2-81}dx$
$5^2-7\cdot5+10$
$\left(2x-4\right)\left(2x-3\right)$
$-s-4s-7s$
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