$5xy+7y-17xy+21y$
$x^2=\:7x$
$2x^2+x=\left(x+2\right)^2$
$\left(x+6\right)\left(x+2\right)+\left(x+4\right)\left(x+1\right)-2x^2$
$z^2-24z+49$
$\left(2x^4-6x^3+5x^2-4x+3\right)\cdot\left(2x^2+9x+6\right)$
$x2+x-25=0$
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