$x\left(2x-9\right)=0$
$x^2-17x+18=0$
$3a-4a+5a-7a+12a$
$\left(5x-5\right)+\left(5x+1\right)$
$4x^2-11x+24$
$6.07\cdot4$
$64\left(2+y\right)^2-121\left(z-2\right)^2$
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