$x-7<-9x+13$
$13-\left(-2\right)\times\left(-5\right)+1$
$9x^2+17-38x$
$\frac{x^5-x^4+x^2-2}{x^2+1}2$
$2\left(9x+10\right)+3$
$5x^2=50x$
$5-x^2=3-x$
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