$9x^5-12x^3$
$2+x=1$
$6=\frac{a}{4}+2$
$1^{-7}$
$x+12=3x+20$
$\left(6\right)\:\left(9\right)+\left(6\right)\left(12\right)+5$
$a+\frac{2a+2b}{5}$
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