$\left(x-3\right)\left(x+2\right)$
$f\left(x\right)=\frac{\sin\left(x\right)}{x^2+3x}$
$2 y + 4 ( y + 1 )$
$3n\:+n$
$7\cdot\left(23-5\cdot\left(2+\frac{6}{3}\right)+1\right)+\left(7-5\right)$
$-2x-4y$
$\lim_{n\to\infty}\:\frac{\left(1^{n+2}+1\right)}{1^n+1}$
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