$\sqrt{\frac{x}{x}}-\frac{2}{x+x}$
$s^2+4s+6$
$\:\frac{x}{1+\frac{1}{x}}$
$6x^2+2x+6$
$-7f^8-9f^8$
$\left(2x^{3}-4x^{7}\right)^{2}$
$\left(+3\right)+\left(-2\right)-\left(+4\right)+\left(-3\right)\left(-5\right)+2$
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