$6w+7w$
$3y^2\left(3x^2\right)$
$3^{2x}-4\left(3\right)^x+1=0$
$x^4-31x^2+225$
$4x-3y+2x^2-7x^2$
$-23-5y=-7y-11$
$\left(x^{3}-3x^{2}+6x-2\right):\left(x^{2}+x-1\right)$
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