$-x^2+9x+10$
$3x-2x=13$
$x^2-\:6x\:+\:y^2\:=\:7$
$7-6c+9c$
$\left(7m-6n\right)^2$
$2x\left(x^4y^4\right)^4$
$\frac{x-4}{3x}+1=\frac{x+3}{x}$
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