$45\:+\:5\:x\:5\:-\:100$
$3a^2-2a+4$
$\left(2a-\frac{1}{3}\right)^2$
$\left(-12\right)\:-\:\left(+15\right)\:-\left(-23\right)-\left[-\left(+6\right)-\left(-18\right)+\:\left(-13\right)\:\right]$
$6m^2-11m+5$
$3x^4\frac{1}{2x^2}$
$-3f-9f$
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