$20a^2+a-1$
$+1+2+6+5$
$\left(y^7\right)^5$
$\left(5xy-3\right)^3$
$x^2-8x=9$
$x+\sqrt{7-3x}=-1$
$p\left(-2\right)=x^3-2x^2+x$
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