$x^2-9x=c$
$-3+\left(-2\right)-\left(-4\right)$
$x^2-22x-48$
$3^1\cdot\left(10^0-23^0\right)+1^0$
$10+3-\:\:4-5-\left[\:-3+1-\left(2-10\right)\:+4\right]\:-1-3$
$\frac{6}{x+2}=\frac{8}{x}$
$25x^2+80xy+44x$
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